From 7562cc5f56f7a600d80d1465025acf7deae73854 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 2 Jul 2025 15:02:21 +0300
Subject: [PATCH 01/54] chore(*): Cell merge POC.

---
 .../src/lib/grids/common/enums.ts             |  14 ++
 .../src/lib/grids/common/grid.interface.ts    |   4 +-
 .../src/lib/grids/grid-base.directive.ts      |  19 +-
 .../lib/grids/grid/grid-row.component.html    |  48 ++++-
 .../src/lib/grids/grid/grid.component.html    |   3 +-
 .../src/lib/grids/grid/grid.component.ts      |   5 +-
 .../src/lib/grids/grid/grid.pipes.ts          |  40 ++++
 .../src/lib/grids/row.directive.ts            |  10 +
 src/app/app.component.ts                      |   5 +
 src/app/app.routes.ts                         |   5 +
 .../grid-cellMerging.component.html           |  15 ++
 .../grid-cellMerging.component.scss           |  19 ++
 .../grid-cellMerging.component.ts             | 190 ++++++++++++++++++
 13 files changed, 371 insertions(+), 6 deletions(-)
 create mode 100644 src/app/grid-cellMerging/grid-cellMerging.component.html
 create mode 100644 src/app/grid-cellMerging/grid-cellMerging.component.scss
 create mode 100644 src/app/grid-cellMerging/grid-cellMerging.component.ts

diff --git a/projects/igniteui-angular/src/lib/grids/common/enums.ts b/projects/igniteui-angular/src/lib/grids/common/enums.ts
index 88d277ccd39..bd66328c97e 100644
--- a/projects/igniteui-angular/src/lib/grids/common/enums.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/enums.ts
@@ -73,6 +73,20 @@ export const GridSelectionMode = {
 } as const;
 export type GridSelectionMode = (typeof GridSelectionMode)[keyof typeof GridSelectionMode];
 
+
+/**
+ * Enumeration representing different cell merging modes for the grid elements.
+ * - 'never': Never merge cells.
+ * - 'always': Always merge adjacent cells based on merge strategy.
+ * - 'onSort': Only merge cells in column that are sorted.
+ */
+export const GridCellMergeMode = {
+    never: 'never',
+    always: 'always',
+    onSort: 'onSort'
+} as const;
+export type GridCellMergeMode = (typeof GridCellMergeMode)[keyof typeof GridCellMergeMode];
+
 /** Enumeration representing different column display order options. */
 export const ColumnDisplayOrder = {
     Alphabetical: 'Alphabetical',
diff --git a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
index 3c8d8aa4f38..3b8d8d2e098 100644
--- a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
@@ -1,4 +1,4 @@
-import { ColumnPinningPosition, FilterMode, GridPagingMode, GridSelectionMode, GridSummaryCalculationMode, GridSummaryPosition, GridValidationTrigger, RowPinningPosition, Size } from './enums';
+import { ColumnPinningPosition, FilterMode, GridCellMergeMode, GridPagingMode, GridSelectionMode, GridSummaryCalculationMode, GridSummaryPosition, GridValidationTrigger, RowPinningPosition, Size } from './enums';
 import {
     ISearchInfo, IGridCellEventArgs, IRowSelectionEventArgs, IColumnSelectionEventArgs,
     IPinColumnCancellableEventArgs, IColumnVisibilityChangedEventArgs, IColumnVisibilityChangingEventArgs,
@@ -690,6 +690,7 @@ export interface GridServiceType {
 export interface GridType extends IGridDataBindable {
     /** Represents the locale of the grid: `USD`, `EUR`, `GBP`, `CNY`, `JPY`, etc. */
     locale: string;
+    cellMergeMode: GridCellMergeMode;
     resourceStrings: IGridResourceStrings;
     /* blazorSuppress */
     /** Represents the native HTML element itself */
@@ -1180,6 +1181,7 @@ export interface GridType extends IGridDataBindable {
     getEmptyRecordObjectFor(inRow: RowType): any;
     isSummaryRow(rec: any): boolean;
     isRecordPinned(rec: any): boolean;
+    isRecordMerged(rec: any): boolean;
     getInitialPinnedIndex(rec: any): number;
     isRecordPinnedByViewIndex(rowIndex: number): boolean;
     isColumnGrouped(fieldName: string): boolean;
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 5213151e54e..3398421a771 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -93,7 +93,8 @@ import {
     RowPinningPosition,
     GridPagingMode,
     GridValidationTrigger,
-    Size
+    Size,
+    GridCellMergeMode
 } from './common/enums';
 import {
     IGridCellEventArgs,
@@ -2911,6 +2912,14 @@ export abstract class IgxGridBaseDirective implements GridType,
         // }
     }
 
+    /**
+     * Gets/Sets cell merge mode.
+     *
+     */
+    @WatchChanges()
+    @Input()
+    public cellMergeMode: GridCellMergeMode = GridCellMergeMode.never;
+
     /**
      * Gets/Sets row selection mode
      *
@@ -3635,6 +3644,14 @@ export abstract class IgxGridBaseDirective implements GridType,
         return this.getInitialPinnedIndex(rec) !== -1;
     }
 
+    /**
+     * @hidden
+     * @internal
+     */
+    public isRecordMerged(rec) {
+        return rec.cellMergeMeta;
+    }
+
     /**
      * @hidden
      * @internal
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index 7289bc16f29..99124fd2124 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -31,7 +31,19 @@
             }
         }
         <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]="grid.unpinnedWidth" [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]="grid.trackColumnChanges" #igxDirRef>
-            <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+            @if (this.hasMergedCells) {
+                <div [style.height.px]="this.grid.rowHeight"
+                     [style.visibility]="this.data.cellMergeMeta.get(col.field).root ? 'hidden' : 'visible'"
+                     class="igx-grid__mrl-block" [ngStyle]="{
+                    'grid-template-rows':this.getMergeCellSpan(col)
+                }">
+                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : mergedCellTemplate; context: getContext(col, this)"></ng-container>
+            </div>
+            }
+            @else {
+                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+            }
+
         </ng-template>
         @if (pinnedColumns.length > 0 && !grid.isPinningToStart) {
             @for (col of pinnedColumns | igxNotGrouped; track trackPinnedColumn(col)) {
@@ -158,6 +170,40 @@
     </igx-expandable-grid-cell>
 </ng-template>
 
+<ng-template #mergedCellTemplate let-col>
+    <igx-grid-cell
+    class="igx-grid__td igx-grid__td--fw"
+    [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
+    [class.igx-grid__td--pinned]="col.pinned"
+    [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
+    [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+    [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+    [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
+    [column]="col"
+    [lastPinned]="col.columnLayoutChild ? null : col.isLastPinned"
+    [firstPinned]="col.columnLayoutChild ? null : col.isFirstPinned"
+    [formatter]="col.formatter"
+    [intRow]="this"
+    [rowData]="data.recordRef"
+    [visibleColumnIndex]="col.visibleIndex"
+    [value]="data.recordRef | dataMapper:col.field:grid.pipeTrigger:data.recordRef[col.field]:col.hasNestedPath"
+    [cellTemplate]="col.bodyTemplate"
+    [cellValidationErrorTemplate]="col.errorTemplate"
+    [lastSearchInfo]="grid.lastSearchInfo"
+    [active]="isCellActive(col.visibleIndex)"
+    [cellSelectionMode]="grid.cellSelection"
+    [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+    [style.height.px]="data.cellMergeMeta.get(col.field).rowSpan * (this.grid.rowHeight + 1)"
+    [style.zIndex]="100"
+    [style.min-width]="col.resolvedWidth"
+    [style.max-width]="col.resolvedWidth"
+    [style.flex-basis]="col.resolvedWidth"
+    [width]="col.getCellWidth()"
+    [style.background]="'white'"
+    #cell>
+</igx-grid-cell>
+</ng-template>
+
 <ng-template #mrlCellTemplate let-col>
     <igx-grid-cell
         class="igx-grid__td igx-grid__td--fw"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 38c010bae76..cf02d0ab7d0 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -80,7 +80,8 @@
         | gridSummary:hasSummarizedColumns:summaryCalculationMode:summaryPosition:id:showSummaryOnCollapse:pipeTrigger:summaryPipeTrigger
         | gridDetails:hasDetails:expansionStates:pipeTrigger
         | gridAddRow:false:pipeTrigger
-        | gridRowPinning:id:false:pipeTrigger"
+        | gridRowPinning:id:false:pipeTrigger
+        | gridCellMerge:pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight"
             [igxForItemSize]="hasColumnLayouts ? rowHeight * multiRowLayoutRowSize + 1 : renderedRowHeight"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index ddf918f42b7..927692b4a45 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -34,7 +34,7 @@ import { IGridGroupingStrategy } from '../common/strategy';
 import { IgxGridValidationService } from './grid-validation.service';
 import { IgxGridDetailsPipe } from './grid.details.pipe';
 import { IgxGridSummaryPipe } from './grid.summary.pipe';
-import { IgxGridGroupingPipe, IgxGridPagingPipe, IgxGridSortingPipe, IgxGridFilteringPipe } from './grid.pipes';
+import { IgxGridGroupingPipe, IgxGridPagingPipe, IgxGridSortingPipe, IgxGridFilteringPipe, IgxGridCellMergePipe } from './grid.pipes';
 import { IgxSummaryDataPipe } from '../summaries/grid-root-summary.pipe';
 import { IgxGridTransactionPipe, IgxHasVisibleColumnsPipe, IgxGridRowPinningPipe, IgxGridAddRowPipe, IgxGridRowClassesPipe, IgxGridRowStylesPipe, IgxStringReplacePipe } from '../common/pipes';
 import { IgxGridColumnResizerComponent } from '../resizing/resizer.component';
@@ -151,7 +151,8 @@ export interface IGroupingDoneEventArgs extends IBaseEventArgs {
         IgxGridFilteringPipe,
         IgxGridSummaryPipe,
         IgxGridDetailsPipe,
-        IgxStringReplacePipe
+        IgxStringReplacePipe,
+        IgxGridCellMergePipe
     ],
     schemas: [CUSTOM_ELEMENTS_SCHEMA]
 })
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 4f5a4238eb4..2b6304904ff 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -9,6 +9,7 @@ import { GridType, IGX_GRID_BASE } from '../common/grid.interface';
 import { FilterUtil, IFilteringStrategy } from '../../data-operations/filtering-strategy';
 import { ISortingExpression } from '../../data-operations/sorting-strategy';
 import { IGridSortingStrategy, IGridGroupingStrategy } from '../common/strategy';
+import { GridCellMergeMode } from 'igniteui-angular';
 
 /**
  * @hidden
@@ -76,6 +77,45 @@ export class IgxGridGroupingPipe implements PipeTransform {
     }
 }
 
+@Pipe({
+    name: 'gridCellMerge',
+    standalone: true
+})
+export class IgxGridCellMergePipe implements PipeTransform {
+
+    constructor(@Inject(IGX_GRID_BASE) private grid: GridType) { }
+
+    public transform(collection: any, _pipeTrigger: number) {
+        if (this.grid.cellMergeMode === GridCellMergeMode.never) {
+            return collection;
+        }
+        const visibleColumns = this.grid.visibleColumns;
+        let prev = null;
+        let result = [];
+        for (const rec of collection) {
+            let recData = { recordRef: rec, cellMergeMeta: new Map<string, IMergeByResult>() };
+            for (const col of visibleColumns) {
+                    recData.cellMergeMeta.set(col.field, { rowSpan: 1 });
+                    //TODO condition can be a strategy or some callback that the user can set.
+                    //TODO can also be limited to only sorted columns
+                    if ( prev && prev.recordRef[col.field] === rec[col.field]) {
+                        const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
+                        root.cellMergeMeta.get(col.field).rowSpan += 1;
+                        recData.cellMergeMeta.get(col.field).root = root;
+                    }
+            }
+            prev = recData;
+            result.push(recData);
+        }
+        return result;
+    }
+}
+
+export interface IMergeByResult {
+    rowSpan: number;
+    root?: any;
+}
+
 /**
  * @hidden
  */
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index b2118b1f15e..a353b728c6e 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -27,6 +27,7 @@ import { mergeWith } from 'lodash-es';
 import { Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
 import { trackByIdentity } from '../core/utils';
+import { IMergeByResult } from './grid/grid.pipes';
 
 @Directive({
     selector: '[igxRowBaseComponent]',
@@ -117,6 +118,10 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         return this.grid.isRecordPinned(this.data);
     }
 
+    public get hasMergedCells(): boolean {
+            return this.grid.isRecordMerged(this.data);
+    }
+
     /**
      * Gets the expanded state of the row.
      * ```typescript
@@ -592,6 +597,11 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         this.addAnimationEnd.emit(this);
     }
 
+    protected getMergeCellSpan(col: ColumnType){
+        const rowCount = this.data.cellMergeMeta.get(col.field).rowSpan;
+        return `repeat(${rowCount},51px)`;
+    }
+
     /**
      * @hidden
      */
diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index c4637552c6b..c3d2d4d104b 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -211,6 +211,11 @@ export class AppComponent implements OnInit {
             icon: 'view_column',
             name: 'Grid Cell Editing'
         },
+        {
+            link: '/gridCellMerging',
+            icon: 'view_column',
+            name: 'Grid Cell Merging'
+        },
         {
             link: '/gridClipboard',
             icon: 'insert_comment',
diff --git a/src/app/app.routes.ts b/src/app/app.routes.ts
index 992516f1574..5234d396dc1 100644
--- a/src/app/app.routes.ts
+++ b/src/app/app.routes.ts
@@ -51,6 +51,7 @@ import { TimePickerSampleComponent } from './time-picker/time-picker.sample';
 import { ToastShowcaseSampleComponent } from './toast-showcase/toast-showcase.sample';
 import { VirtualForSampleComponent } from './virtual-for-directive/virtual-for.sample';
 import { GridCellEditingComponent } from './grid-cellEditing/grid-cellEditing.component';
+import { GridCellMergingComponent } from './grid-cellMerging/grid-cellMerging.component';
 import { GridSampleComponent } from './grid/grid.sample';
 import { GridColumnMovingSampleComponent } from './grid-column-moving/grid-column-moving.sample';
 import { GridColumnSelectionSampleComponent } from './grid-column-selection/grid-column-selection.sample';
@@ -419,6 +420,10 @@ export const appRoutes: Routes = [
         path: 'gridCellEditing',
         component: GridCellEditingComponent
     },
+    {
+        path: 'gridCellMerging',
+        component: GridCellMergingComponent
+    },
     {
         path: 'gridConditionalCellStyling',
         component: GridCellStylingSampleComponent
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
new file mode 100644
index 00000000000..6b2628ac345
--- /dev/null
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -0,0 +1,15 @@
+<h4 class="sample-title">Grid with cell merge</h4>
+<igx-grid [data]="data" width="800px" height="550px" [moving]="true" [cellMergeMode]="'always'">
+    <igx-column field="ProductID" header="Product ID" width="200px">
+    </igx-column>
+    <igx-column field="ReorderLevel" width="200px">
+    </igx-column>
+    <igx-column required field="ProductName" width="200px">
+    </igx-column>
+    <igx-column field="UnitsInStock" header="UnitsInStock" width="200px">
+    </igx-column>
+    <igx-column field="OrderDate" width="200px">
+    </igx-column>
+    <igx-column field="Discontinued" header="Discontinued">
+    </igx-column>
+</igx-grid>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.scss b/src/app/grid-cellMerging/grid-cellMerging.component.scss
new file mode 100644
index 00000000000..3d4037836d0
--- /dev/null
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.scss
@@ -0,0 +1,19 @@
+.sample-actions {
+    display: flex;
+    flex-wrap: wrap;
+    margin: 1rem 0;
+    gap: 0.5rem;
+}
+
+.density-chooser {
+    margin-bottom: 1rem;
+
+    igx-buttongroup {
+        display: block;
+        width: 500px;
+    }
+}
+
+.grid-size {
+    --ig-size: var(--ig-size-small);
+}
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
new file mode 100644
index 00000000000..c2b9d9c0a88
--- /dev/null
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -0,0 +1,190 @@
+import { Component, HostBinding, ViewChild } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import {
+    IgxColumnComponent,
+    IgxGridComponent,
+} from 'igniteui-angular';
+
+import { data, dataWithoutPK } from '../shared/data';
+
+@Component({
+    selector: 'app-grid-cellMerging',
+    templateUrl: 'grid-cellMerging.component.html',
+    styleUrl: 'grid-cellMerging.component.scss',
+    imports: [
+        FormsModule,
+        IgxColumnComponent,
+        IgxGridComponent,
+    ]
+})
+export class GridCellMergingComponent {
+    public data = [{
+        ProductID: 1,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '10 boxes x 20 bags',
+        UnitPrice: '18.0000',
+        UnitsInStock: 39,
+        UnitsOnOrder: 0,
+        ReorderLevel: 10.567,
+        Discontinued: false,
+        OrderDate: null,
+        OrderDate2: new Date(1991, 2, 12, 18, 40, 50).toISOString()
+    }, {
+        ProductID: 2,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 3,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 4,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '20.0000',
+        UnitsInStock: 20,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 5,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 6,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 7,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 8,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 30,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 9,
+        ProductName: 'Aniseed Syrup',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 13,
+        UnitsOnOrder: 70,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
+    {
+        ProductID: 10,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 13,
+        UnitsOnOrder: 70,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
+    {
+        ProductID: 11,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 13,
+        UnitsOnOrder: 70,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
+    {
+        ProductID: 12,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 12,
+        UnitsOnOrder: 70,
+        ReorderLevel: 30,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    }];
+
+}
+

From f42bb3c7d6f7f94938351138d24c046bf0ec4422 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 2 Jul 2025 16:47:10 +0300
Subject: [PATCH 02/54] chore(*): Minor tweaks to suggestion.

---
 .../lib/grids/grid/grid-row.component.html    |   2 +-
 .../src/lib/grids/grid/grid.pipes.ts          |  13 +-
 .../grid-cellMerging.component.ts             | 167 ++++++++++++++++++
 3 files changed, 178 insertions(+), 4 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index 99124fd2124..e3b00c36d28 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -194,7 +194,7 @@
     [cellSelectionMode]="grid.cellSelection"
     [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
     [style.height.px]="data.cellMergeMeta.get(col.field).rowSpan * (this.grid.rowHeight + 1)"
-    [style.zIndex]="100"
+    [style.zIndex]="data.cellMergeMeta.get(col.field).rowSpan"
     [style.min-width]="col.resolvedWidth"
     [style.max-width]="col.resolvedWidth"
     [style.flex-basis]="col.resolvedWidth"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 2b6304904ff..2aa8eafd495 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -99,9 +99,15 @@ export class IgxGridCellMergePipe implements PipeTransform {
                     //TODO condition can be a strategy or some callback that the user can set.
                     //TODO can also be limited to only sorted columns
                     if ( prev && prev.recordRef[col.field] === rec[col.field]) {
-                        const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
-                        root.cellMergeMeta.get(col.field).rowSpan += 1;
-                        recData.cellMergeMeta.get(col.field).root = root;
+                        // const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
+                        // root.cellMergeMeta.get(col.field).rowSpan += 1;
+                        // recData.cellMergeMeta.get(col.field).root = root;
+                        recData.cellMergeMeta.get(col.field).prev = prev;
+                        let curr = prev;
+                        while(curr) {
+                            curr.cellMergeMeta.get(col.field).rowSpan += 1;
+                            curr =  curr.cellMergeMeta.get(col.field).prev;
+                        }
                     }
             }
             prev = recData;
@@ -114,6 +120,7 @@ export class IgxGridCellMergePipe implements PipeTransform {
 export interface IMergeByResult {
     rowSpan: number;
     root?: any;
+    prev?: any;
 }
 
 /**
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index c2b9d9c0a88..c4184a997ae 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -171,6 +171,173 @@ export class GridCellMergingComponent {
         OrderDate: new Date('2006-03-17').toISOString(),
         OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
     },
+    {
+        ProductID: 12,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 12,
+        UnitsOnOrder: 70,
+        ReorderLevel: 30,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
+    {
+        ProductID: 1,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '10 boxes x 20 bags',
+        UnitPrice: '18.0000',
+        UnitsInStock: 39,
+        UnitsOnOrder: 0,
+        ReorderLevel: 10.567,
+        Discontinued: false,
+        OrderDate: null,
+        OrderDate2: new Date(1991, 2, 12, 18, 40, 50).toISOString()
+    }, {
+        ProductID: 2,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 3,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 4,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '20.0000',
+        UnitsInStock: 20,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 5,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 6,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 7,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 8,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 1,
+        QuantityPerUnit: '24 - 12 oz bottles',
+        UnitPrice: '19.0000',
+        UnitsInStock: 17,
+        UnitsOnOrder: 40,
+        ReorderLevel: 30,
+        Discontinued: false,
+        OrderDate: new Date('2003-03-17').toISOString(),
+        OrderDate2: new Date('2003-03-17').toISOString()
+    },
+    {
+        ProductID: 9,
+        ProductName: 'Aniseed Syrup',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 13,
+        UnitsOnOrder: 70,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
+    {
+        ProductID: 10,
+        ProductName: 'Chang',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 13,
+        UnitsOnOrder: 70,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
+    {
+        ProductID: 11,
+        ProductName: 'Chai',
+        SupplierID: 1,
+        CategoryID: 2,
+        QuantityPerUnit: '12 - 550 ml bottles',
+        UnitPrice: '10.0000',
+        UnitsInStock: 13,
+        UnitsOnOrder: 70,
+        ReorderLevel: 25,
+        Discontinued: false,
+        OrderDate: new Date('2006-03-17').toISOString(),
+        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
+    },
     {
         ProductID: 12,
         ProductName: 'Chai',

From 870e7f61f966e3353502d9f93342d0c1e72caa08 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 3 Jul 2025 17:46:06 +0300
Subject: [PATCH 03/54] chore(*): Implement with rows that are retained outside
 the virt.frame.

---
 .../src/lib/grids/grid-base.directive.ts       |  5 +++++
 .../src/lib/grids/grid/grid-row.component.html |  1 -
 .../src/lib/grids/grid/grid.component.html     |  8 ++++++++
 .../src/lib/grids/grid/grid.component.ts       | 11 +++++++++++
 .../src/lib/grids/grid/grid.pipes.ts           | 18 +++++++++---------
 .../grid-cellMerging.component.html            |  4 +---
 6 files changed, 34 insertions(+), 13 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 3398421a771..659e5e6e18c 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3652,6 +3652,11 @@ export abstract class IgxGridBaseDirective implements GridType,
         return rec.cellMergeMeta;
     }
 
+    public getMergeCellOffset(rec) {
+        const index = this.verticalScrollContainer.igxForOf.indexOf(rec);
+        return -(this.verticalScrollContainer.scrollPosition - this.verticalScrollContainer.getScrollForIndex(index));
+    }
+
     /**
      * @hidden
      * @internal
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index e3b00c36d28..d477ce770ad 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -199,7 +199,6 @@
     [style.max-width]="col.resolvedWidth"
     [style.flex-basis]="col.resolvedWidth"
     [width]="col.getCellWidth()"
-    [style.background]="'white'"
     #cell>
 </igx-grid-cell>
 </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index cf02d0ab7d0..fc0df2e4644 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -47,6 +47,14 @@
         }
         <ng-container *ngTemplateOutlet="hasPinnedRecords && isRowPinningToTop ? pinnedRecordsTemplate : null">
         </ng-container>
+
+
+        @for (rowData of mergedData; track rowData; let rowIndex = $index) {
+            <igx-grid-row [style.background]="'red'" [style.position]="'absolute'" [gridID]="id" [index]="rowIndex" [data]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
+            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+            [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
+            </igx-grid-row>
+        }
         <ng-template #pinnedRecordsTemplate>
             @if (data
                 | gridTransaction:id:pipeTrigger
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index 927692b4a45..d1d0a3fa116 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -389,6 +389,17 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
     private _groupByRowSelectorTemplate: TemplateRef<IgxGroupByRowSelectorTemplateContext>;
     private _detailTemplate;
 
+    public get mergedData() {
+        const startIndex = this.verticalScrollContainer.state.startIndex;
+        const chunkSize = this.verticalScrollContainer.state.chunkSize;
+        const mergeRecs = this.verticalScrollContainer.igxForOf?.filter((x, index) => {
+            if (!x.cellMergeMeta) { return false;}
+            const maxSpan = Math.max(...x.cellMergeMeta.values().toArray().map(x => x.rowSpan));
+           return startIndex > index && startIndex <= (index + maxSpan) && startIndex + chunkSize >= (index + maxSpan);
+    });
+        return mergeRecs;
+    }
+
 
     /**
      * Gets/Sets the array of data that populates the component.
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 2aa8eafd495..d9e5900c410 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -99,15 +99,15 @@ export class IgxGridCellMergePipe implements PipeTransform {
                     //TODO condition can be a strategy or some callback that the user can set.
                     //TODO can also be limited to only sorted columns
                     if ( prev && prev.recordRef[col.field] === rec[col.field]) {
-                        // const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
-                        // root.cellMergeMeta.get(col.field).rowSpan += 1;
-                        // recData.cellMergeMeta.get(col.field).root = root;
-                        recData.cellMergeMeta.get(col.field).prev = prev;
-                        let curr = prev;
-                        while(curr) {
-                            curr.cellMergeMeta.get(col.field).rowSpan += 1;
-                            curr =  curr.cellMergeMeta.get(col.field).prev;
-                        }
+                        const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
+                        root.cellMergeMeta.get(col.field).rowSpan += 1;
+                        recData.cellMergeMeta.get(col.field).root = root;
+                        // recData.cellMergeMeta.get(col.field).prev = prev;
+                        // let curr = prev;
+                        // while(curr) {
+                        //     curr.cellMergeMeta.get(col.field).rowSpan += 1;
+                        //     curr =  curr.cellMergeMeta.get(col.field).prev;
+                        // }
                     }
             }
             prev = recData;
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 6b2628ac345..bc1c1f1bc9c 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,5 +1,5 @@
 <h4 class="sample-title">Grid with cell merge</h4>
-<igx-grid [data]="data" width="800px" height="550px" [moving]="true" [cellMergeMode]="'always'">
+<igx-grid [data]="data" width="800px" height="550px" [moving]="true" [cellMergeMode]="'always'" >
     <igx-column field="ProductID" header="Product ID" width="200px">
     </igx-column>
     <igx-column field="ReorderLevel" width="200px">
@@ -10,6 +10,4 @@ <h4 class="sample-title">Grid with cell merge</h4>
     </igx-column>
     <igx-column field="OrderDate" width="200px">
     </igx-column>
-    <igx-column field="Discontinued" header="Discontinued">
-    </igx-column>
 </igx-grid>

From bb4e39fcce4350ab6111f6291c00f5b72537c845 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 7 Jul 2025 14:46:10 +0300
Subject: [PATCH 04/54] chore(*): Fix border styles.

---
 projects/igniteui-angular/src/lib/grids/common/pipes.ts   | 2 +-
 .../src/lib/grids/grid/grid-row.component.html            | 8 +++++---
 projects/igniteui-angular/src/lib/grids/row.directive.ts  | 4 ++++
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/common/pipes.ts b/projects/igniteui-angular/src/lib/grids/common/pipes.ts
index 818a0ea3854..371245c96ad 100644
--- a/projects/igniteui-angular/src/lib/grids/common/pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/pipes.ts
@@ -126,7 +126,7 @@ export class IgxGridRowClassesPipe implements PipeTransform {
             [dirty, 'igx-grid__tr--edited'],
             [deleted, 'igx-grid__tr--deleted'],
             [dragging, 'igx-grid__tr--drag'],
-            [mrl, 'igx-grid__tr--mrl'],
+            [mrl || _rowData.cellMergeMeta, 'igx-grid__tr--mrl'],
             // Tree grid only
             [filteredOut, 'igx-grid__tr--filtered']
         ];
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index d477ce770ad..6111ac5ec15 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -32,9 +32,10 @@
         }
         <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]="grid.unpinnedWidth" [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]="grid.trackColumnChanges" #igxDirRef>
             @if (this.hasMergedCells) {
-                <div [style.height.px]="this.grid.rowHeight"
+                <div [style.height.px]="getRowHeight()"
+                     class="igx-grid__mrl-block"
                      [style.visibility]="this.data.cellMergeMeta.get(col.field).root ? 'hidden' : 'visible'"
-                     class="igx-grid__mrl-block" [ngStyle]="{
+                     [ngStyle]="{
                     'grid-template-rows':this.getMergeCellSpan(col)
                 }">
                 <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : mergedCellTemplate; context: getContext(col, this)"></ng-container>
@@ -173,6 +174,7 @@
 <ng-template #mergedCellTemplate let-col>
     <igx-grid-cell
     class="igx-grid__td igx-grid__td--fw"
+    [class.igx-grid__td--merged]="data.cellMergeMeta.get(col.field).rowSpan > 1"
     [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
     [class.igx-grid__td--pinned]="col.pinned"
     [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
@@ -193,7 +195,7 @@
     [active]="isCellActive(col.visibleIndex)"
     [cellSelectionMode]="grid.cellSelection"
     [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-    [style.height.px]="data.cellMergeMeta.get(col.field).rowSpan * (this.grid.rowHeight + 1)"
+    [style.gridRow]="'1 / -1'"
     [style.zIndex]="data.cellMergeMeta.get(col.field).rowSpan"
     [style.min-width]="col.resolvedWidth"
     [style.max-width]="col.resolvedWidth"
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index a353b728c6e..7a44f1851d1 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -602,6 +602,10 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         return `repeat(${rowCount},51px)`;
     }
 
+    protected getRowHeight() {
+        return this.grid.rowHeight;
+    }
+
     /**
      * @hidden
      */

From e160c650c0f8b6f66db193b448649247c6c3d922 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 7 Jul 2025 15:25:33 +0300
Subject: [PATCH 05/54] chore(*): Add handling for variable row height.

---
 .../src/lib/grids/grid/grid-row.component.html             | 4 ++--
 projects/igniteui-angular/src/lib/grids/row.directive.ts   | 6 ++++--
 src/app/grid-cellMerging/grid-cellMerging.component.html   | 7 +++++++
 src/app/grid-cellMerging/grid-cellMerging.component.ts     | 4 ++++
 4 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index 6111ac5ec15..a2391599eed 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -32,11 +32,11 @@
         }
         <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]="grid.unpinnedWidth" [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]="grid.trackColumnChanges" #igxDirRef>
             @if (this.hasMergedCells) {
-                <div [style.height.px]="getRowHeight()"
+                <div [style.height.px]=" this.data.cellMergeMeta.get(col.field).rowSpan > 1 ? getRowHeight() : null"
                      class="igx-grid__mrl-block"
                      [style.visibility]="this.data.cellMergeMeta.get(col.field).root ? 'hidden' : 'visible'"
                      [ngStyle]="{
-                    'grid-template-rows':this.getMergeCellSpan(col)
+                    'grid-template-rows': this.data.cellMergeMeta.get(col.field).rowSpan > 1 ? this.getMergeCellSpan(col) : null
                 }">
                 <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : mergedCellTemplate; context: getContext(col, this)"></ng-container>
             </div>
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 7a44f1851d1..9ebf02488d6 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -599,11 +599,13 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
 
     protected getMergeCellSpan(col: ColumnType){
         const rowCount = this.data.cellMergeMeta.get(col.field).rowSpan;
-        return `repeat(${rowCount},51px)`;
+        const rowH = this.grid.verticalScrollContainer.getSizeAt(this.index);
+        return `repeat(${rowCount},${rowH}px)`;
     }
 
     protected getRowHeight() {
-        return this.grid.rowHeight;
+        const size = this.grid.verticalScrollContainer.getSizeAt(this.index) - 1;
+        return size || this.grid.rowHeight;
     }
 
     /**
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index bc1c1f1bc9c..b5f66aaf5dc 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,6 +1,13 @@
 <h4 class="sample-title">Grid with cell merge</h4>
 <igx-grid [data]="data" width="800px" height="550px" [moving]="true" [cellMergeMode]="'always'" >
     <igx-column field="ProductID" header="Product ID" width="200px">
+        <ng-template igxCell let-cell="cell" let-val>
+        <div>
+            <button igxButton>Test</button>
+            <br/>
+            <button igxButton>Test 2</button>
+        </div>
+        </ng-template>
     </igx-column>
     <igx-column field="ReorderLevel" width="200px">
     </igx-column>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index c4184a997ae..0d79c827d11 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -1,6 +1,8 @@
 import { Component, HostBinding, ViewChild } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import {
+    IgxButtonDirective,
+    IgxCellTemplateDirective,
     IgxColumnComponent,
     IgxGridComponent,
 } from 'igniteui-angular';
@@ -15,6 +17,8 @@ import { data, dataWithoutPK } from '../shared/data';
         FormsModule,
         IgxColumnComponent,
         IgxGridComponent,
+        IgxCellTemplateDirective,
+        IgxButtonDirective
     ]
 })
 export class GridCellMergingComponent {

From 4667bb083ba7d63982b95b333172fff51f9b5221 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 7 Jul 2025 15:44:31 +0300
Subject: [PATCH 06/54] chore(*): Add handling if different rows have different
 sizes.

---
 projects/igniteui-angular/src/lib/grids/row.directive.ts | 8 ++++++--
 src/app/grid-cellMerging/grid-cellMerging.component.html | 7 +++++--
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 9ebf02488d6..d61923064bf 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -599,8 +599,12 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
 
     protected getMergeCellSpan(col: ColumnType){
         const rowCount = this.data.cellMergeMeta.get(col.field).rowSpan;
-        const rowH = this.grid.verticalScrollContainer.getSizeAt(this.index);
-        return `repeat(${rowCount},${rowH}px)`;
+        let sizeSpans = "";
+        for (let index = this.index; index < this.index + rowCount; index++) {
+            const size = this.grid.verticalScrollContainer.getSizeAt(index);
+            sizeSpans += size + 'px ';
+        }
+        return `${sizeSpans}`;
     }
 
     protected getRowHeight() {
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index b5f66aaf5dc..a745f0cb5ce 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -4,8 +4,11 @@ <h4 class="sample-title">Grid with cell merge</h4>
         <ng-template igxCell let-cell="cell" let-val>
         <div>
             <button igxButton>Test</button>
-            <br/>
-            <button igxButton>Test 2</button>
+            @if (cell.row.index % 2 == 0) {
+                <br/>
+                <button igxButton>Test 2</button>
+            }
+
         </div>
         </ng-template>
     </igx-column>

From febbd43e19776bcfba9cd44e9e83ec6a42a93595 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 7 Jul 2025 16:53:10 +0300
Subject: [PATCH 07/54] chore(*): Extract hardcoded styles in class.

---
 .../styles/components/grid/_grid-component.scss   |  4 ++++
 .../core/styles/components/grid/_grid-theme.scss  | 15 ++++++++++-----
 .../src/lib/grids/grid/grid-row.component.html    |  2 --
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
index f446ffbe128..93737fc219c 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
@@ -296,6 +296,10 @@
             @extend %igx-grid__td--edited !optional;
         }
 
+        @include e(td, $m: merged) {
+            @extend %igx-grid__td--merged !optional;
+        }
+
         @include e(td, $m: editing) {
             @extend %igx-grid__td--editing !optional;
         }
diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
index 0166b635863..47123b240b3 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
@@ -1872,6 +1872,11 @@
         }
     }
 
+    %igx-grid__td--merged {
+        z-index: 1;
+        grid-row: 1 / -1;
+    }
+
     %igx-grid__tr--deleted {
         %grid-cell-text {
             font-style: italic;
@@ -2084,7 +2089,7 @@
 
         .sort-icon {
             color: var-get($theme, 'header-selected-text-color');
-	        
+
             ::after {
                 background: var-get($theme, 'header-selected-background');
             }
@@ -2112,7 +2117,7 @@
         &%igx-grid-th--sorted {
             .sort-icon {
                 color: var-get($theme, 'header-selected-text-color');
-	            
+
 	            > igx-icon {
 		            color: inherit;
 	            }
@@ -2120,7 +2125,7 @@
                 &:focus,
                 &:hover {
                     color: var-get($theme, 'header-selected-text-color');
-	                
+
 	                > igx-icon {
 		                color: inherit;
 	                }
@@ -2177,14 +2182,14 @@
         .sort-icon {
             opacity: 1;
             color: var-get($theme, 'sorted-header-icon-color');
-	        
+
 	        > igx-icon {
 		        color: inherit;
 	        }
 
             &:hover {
                 color: var-get($theme, 'sortable-header-icon-hover-color');
-	            
+
 	            > igx-icon {
 		            color: inherit;
 	            }
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index a2391599eed..c87ab17861c 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -195,8 +195,6 @@
     [active]="isCellActive(col.visibleIndex)"
     [cellSelectionMode]="grid.cellSelection"
     [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-    [style.gridRow]="'1 / -1'"
-    [style.zIndex]="data.cellMergeMeta.get(col.field).rowSpan"
     [style.min-width]="col.resolvedWidth"
     [style.max-width]="col.resolvedWidth"
     [style.flex-basis]="col.resolvedWidth"

From 4c5d922f1e287f9ac160df2c1385b4f42eb7c70a Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 7 Jul 2025 17:27:53 +0300
Subject: [PATCH 08/54] chore(*): Adjust API and members.

---
 .../src/lib/grids/columns/column.component.ts  |  9 +++++++++
 .../src/lib/grids/common/enums.ts              |  1 -
 .../src/lib/grids/common/grid.interface.ts     |  1 +
 .../src/lib/grids/grid-base.directive.ts       |  2 +-
 .../src/lib/grids/grid/grid-row.component.html |  8 ++++----
 .../src/lib/grids/grid/grid.pipes.ts           | 18 ++++++++----------
 .../grid-cellMerging.component.html            |  6 +++---
 7 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/columns/column.component.ts b/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
index 3482a5076f1..0809995f477 100644
--- a/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
@@ -107,6 +107,15 @@ export class IgxColumnComponent implements AfterContentInit, OnDestroy, ColumnTy
         return this._field;
     }
 
+    /**
+     * Sets/gets whether to merge cells in this column.
+     * ```html
+     * <igx-column [merge]="true"></igx-column>
+     * ```
+     *
+     */
+    @Input()
+    public merge = false;
 
     /**
      * @hidden @internal
diff --git a/projects/igniteui-angular/src/lib/grids/common/enums.ts b/projects/igniteui-angular/src/lib/grids/common/enums.ts
index bd66328c97e..fd19aa101ca 100644
--- a/projects/igniteui-angular/src/lib/grids/common/enums.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/enums.ts
@@ -81,7 +81,6 @@ export type GridSelectionMode = (typeof GridSelectionMode)[keyof typeof GridSele
  * - 'onSort': Only merge cells in column that are sorted.
  */
 export const GridCellMergeMode = {
-    never: 'never',
     always: 'always',
     onSort: 'onSort'
 } as const;
diff --git a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
index 3b8d8d2e098..259e621c056 100644
--- a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
@@ -453,6 +453,7 @@ export interface ColumnType extends FieldType {
     pinned: boolean;
     /** Indicates if the column is currently expanded or collapsed. If the value is true, the column is expanded */
     expanded: boolean;
+    merge: boolean;
     /** Indicates if the column is currently selected. If the value is true, the column is selected */
     selected: boolean;
     /** Indicates if the column can be selected. If the value is true, the column can be selected */
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 659e5e6e18c..b5a0123f568 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -2918,7 +2918,7 @@ export abstract class IgxGridBaseDirective implements GridType,
      */
     @WatchChanges()
     @Input()
-    public cellMergeMode: GridCellMergeMode = GridCellMergeMode.never;
+    public cellMergeMode: GridCellMergeMode = GridCellMergeMode.onSort;
 
     /**
      * Gets/Sets row selection mode
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index c87ab17861c..0489078ac7d 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -32,11 +32,11 @@
         }
         <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]="grid.unpinnedWidth" [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]="grid.trackColumnChanges" #igxDirRef>
             @if (this.hasMergedCells) {
-                <div [style.height.px]=" this.data.cellMergeMeta.get(col.field).rowSpan > 1 ? getRowHeight() : null"
+                <div [style.height.px]=" this.data.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
                      class="igx-grid__mrl-block"
-                     [style.visibility]="this.data.cellMergeMeta.get(col.field).root ? 'hidden' : 'visible'"
+                     [style.visibility]="this.data.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
                      [ngStyle]="{
-                    'grid-template-rows': this.data.cellMergeMeta.get(col.field).rowSpan > 1 ? this.getMergeCellSpan(col) : null
+                    'grid-template-rows': this.data.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
                 }">
                 <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : mergedCellTemplate; context: getContext(col, this)"></ng-container>
             </div>
@@ -174,7 +174,7 @@
 <ng-template #mergedCellTemplate let-col>
     <igx-grid-cell
     class="igx-grid__td igx-grid__td--fw"
-    [class.igx-grid__td--merged]="data.cellMergeMeta.get(col.field).rowSpan > 1"
+    [class.igx-grid__td--merged]="data.cellMergeMeta.get(col.field)?.rowSpan > 1"
     [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
     [class.igx-grid__td--pinned]="col.pinned"
     [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index d9e5900c410..73d87e9c00d 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -86,28 +86,26 @@ export class IgxGridCellMergePipe implements PipeTransform {
     constructor(@Inject(IGX_GRID_BASE) private grid: GridType) { }
 
     public transform(collection: any, _pipeTrigger: number) {
-        if (this.grid.cellMergeMode === GridCellMergeMode.never) {
+        const mergeMode = this.grid.cellMergeMode;
+        const sortExpr = this.grid.sortingExpressions;
+        const columnToMerge = this.grid.visibleColumns.filter(
+            x => x.merge && (mergeMode ==='always' ||
+            (mergeMode === 'onSort' && !!sortExpr.find( x=> x.fieldName === x.fieldName)))
+        );
+        if (columnToMerge.length === 0) {
             return collection;
         }
-        const visibleColumns = this.grid.visibleColumns;
         let prev = null;
         let result = [];
         for (const rec of collection) {
             let recData = { recordRef: rec, cellMergeMeta: new Map<string, IMergeByResult>() };
-            for (const col of visibleColumns) {
+            for (const col of columnToMerge) {
                     recData.cellMergeMeta.set(col.field, { rowSpan: 1 });
                     //TODO condition can be a strategy or some callback that the user can set.
-                    //TODO can also be limited to only sorted columns
                     if ( prev && prev.recordRef[col.field] === rec[col.field]) {
                         const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
                         root.cellMergeMeta.get(col.field).rowSpan += 1;
                         recData.cellMergeMeta.get(col.field).root = root;
-                        // recData.cellMergeMeta.get(col.field).prev = prev;
-                        // let curr = prev;
-                        // while(curr) {
-                        //     curr.cellMergeMeta.get(col.field).rowSpan += 1;
-                        //     curr =  curr.cellMergeMeta.get(col.field).prev;
-                        // }
                     }
             }
             prev = recData;
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index a745f0cb5ce..ca4bbb3d153 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -12,11 +12,11 @@ <h4 class="sample-title">Grid with cell merge</h4>
         </div>
         </ng-template>
     </igx-column>
-    <igx-column field="ReorderLevel" width="200px">
+    <igx-column field="ReorderLevel" width="200px" [merge]="true">
     </igx-column>
-    <igx-column required field="ProductName" width="200px">
+    <igx-column required field="ProductName" width="200px" [merge]="true">
     </igx-column>
-    <igx-column field="UnitsInStock" header="UnitsInStock" width="200px">
+    <igx-column field="UnitsInStock" header="UnitsInStock" width="200px" [merge]="true">
     </igx-column>
     <igx-column field="OrderDate" width="200px">
     </igx-column>

From a42b192b63d62753ffc0f19b30a103ccd9ee7e8f Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Tue, 8 Jul 2025 16:33:27 +0300
Subject: [PATCH 09/54] chore(*): Add mergeStrategy for grid and merging
 comparer for column.

---
 .../src/lib/data-operations/data-util.ts      | 19 +++++-
 .../src/lib/data-operations/merge-strategy.ts | 67 +++++++++++++++++++
 .../src/lib/grids/columns/column.component.ts | 26 +++++++
 .../src/lib/grids/common/grid.interface.ts    |  3 +
 .../src/lib/grids/grid-base.directive.ts      | 13 ++++
 .../src/lib/grids/grid/grid.pipes.ts          | 23 +------
 .../src/lib/grids/row.directive.ts            |  1 -
 .../grid-cellMerging.component.html           |  6 +-
 .../grid-cellMerging.component.ts             | 24 +++----
 9 files changed, 143 insertions(+), 39 deletions(-)
 create mode 100644 projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts

diff --git a/projects/igniteui-angular/src/lib/data-operations/data-util.ts b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
index cc0e0d5ad1c..d3e66f19248 100644
--- a/projects/igniteui-angular/src/lib/data-operations/data-util.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
@@ -8,7 +8,7 @@ import { IGroupingState } from './groupby-state.interface';
 import { mergeObjects } from '../core/utils';
 import { Transaction, TransactionType, HierarchicalTransaction } from '../services/transaction/transaction';
 import { getHierarchy, isHierarchyMatch } from './operations';
-import { GridType } from '../grids/common/grid.interface';
+import { ColumnType, GridType } from '../grids/common/grid.interface';
 import { ITreeGridRecord } from '../grids/tree-grid/tree-grid.interfaces';
 import { ISortingExpression } from './sorting-strategy';
 import {
@@ -20,6 +20,7 @@ import {
 } from '../grids/common/strategy';
 import { DefaultDataCloneStrategy, IDataCloneStrategy } from '../data-operations/data-clone-strategy';
 import { IGroupingExpression } from './grouping-expression.interface';
+import { DefaultMergeStrategy, IGridMergeStrategy } from './merge-strategy';
 
 /**
  * @hidden
@@ -37,6 +38,13 @@ import { IGroupingExpression } from './grouping-expression.interface';
 } as const;
 export type DataType = (typeof DataType)[keyof typeof DataType];
 
+
+export interface IMergeByResult {
+    rowSpan: number;
+    root?: any;
+    prev?: any;
+}
+
 /**
  * @hidden
  */
@@ -90,6 +98,15 @@ export class DataUtil {
         return grouping.groupBy(data, state, grid, groupsRecords, fullResult);
     }
 
+    public static merge<T>(data: T[], columns: ColumnType[], strategy: IGridMergeStrategy = new DefaultMergeStrategy(), grid: GridType = null,
+    ): any[] {
+        let result = [];
+        for (const col of columns) {
+            strategy.merge(data, col.field, col.mergingComparer, result);
+        }
+        return result;
+}
+
     public static page<T>(data: T[], state: IPagingState, dataLength?: number): T[] {
         if (!state) {
             return data;
diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
new file mode 100644
index 00000000000..c9afd6fc3f9
--- /dev/null
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -0,0 +1,67 @@
+import { GridCellMergeMode, IMergeByResult } from 'igniteui-angular';
+import type { KeyOfOrString } from '../core/types';
+import { IBaseEventArgs } from '../core/utils';
+import { ColumnType, GridType } from '../grids/common/grid.interface';
+
+
+export interface IGridMergeStrategy {
+    /* blazorSuppress */
+    merge: (
+        data: any[],
+        field: string,
+        comparer: (prevRecord: any, currentRecord: any, field: string) => boolean,
+        result: any[]
+    ) => any[];
+}
+
+export class DefaultMergeStrategy implements IGridMergeStrategy {
+    protected static _instance: DefaultMergeStrategy = null;
+
+    public static instance(): DefaultMergeStrategy {
+        return this._instance || (this._instance = new this());
+    }
+
+    /* blazorSuppress */
+    public merge(
+        data: any[],
+        field: string,
+        comparer: (prevRecord: any, record: any, field: string) => boolean = this.comparer,
+        result: any[]
+    ) {
+        let prev = null;
+        let index = 0;
+        for (const rec of data) {
+            const recData = result[index];
+            let recToUpdateData = recData ?? { recordRef: rec, cellMergeMeta: new Map<string, IMergeByResult>() };
+            recToUpdateData.cellMergeMeta.set(field, { rowSpan: 1 });
+            if (prev && comparer(prev.recordRef, recToUpdateData.recordRef, field)) {
+                const root = prev.cellMergeMeta.get(field)?.root ?? prev;
+                root.cellMergeMeta.get(field).rowSpan += 1;
+                recToUpdateData.cellMergeMeta.get(field).root = root;
+            }
+            prev = recToUpdateData;
+            if (!recData) {
+                result.push(recToUpdateData);
+            }
+            index++;
+        }
+        return result;
+    }
+
+    /* blazorSuppress */
+    public comparer(prevRecord: any, record: any, field: string): boolean {
+        const a = prevRecord[field];
+        const b = record[field];
+        const an = (a === null || a === undefined);
+        const bn = (b === null || b === undefined);
+        if (an) {
+            if (bn) {
+                return true;
+            }
+            return false;
+        } else if (bn) {
+            return false;
+        }
+        return a === b;
+    }
+}
diff --git a/projects/igniteui-angular/src/lib/grids/columns/column.component.ts b/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
index 0809995f477..58b3de78586 100644
--- a/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
@@ -1209,6 +1209,30 @@ export class IgxColumnComponent implements AfterContentInit, OnDestroy, ColumnTy
         this._sortStrategy = classRef;
     }
 
+    /* blazorSuppress */
+    /**
+     * Gets the function that compares values for merging.
+     * ```typescript
+     * let mergingComparer = this.column.mergingComparer'
+     * ```
+     */
+    @Input()
+    public get mergingComparer(): (prevRecord: any, record: any, field: string) => boolean {
+        return this._mergingComparer;
+    }
+
+    /* blazorSuppress */
+    /**
+     * Sets a custom function to compare values for merging.
+     * ```typescript
+     * this.column.mergingComparer = (prevRecord: any, record: any, field: string) => { return prevRecord[field] === record[field]; }
+     * ```
+     */
+    public set mergingComparer(funcRef: (prevRecord: any, record: any, field: string) => boolean) {
+        this._mergingComparer = funcRef;
+    }
+
+
     /* blazorSuppress */
     /**
      * Gets the function that compares values for grouping.
@@ -1849,6 +1873,8 @@ export class IgxColumnComponent implements AfterContentInit, OnDestroy, ColumnTy
      * @hidden
      */
     protected _groupingComparer: (a: any, b: any, currRec?: any, groupRec?: any) => number;
+
+    protected _mergingComparer: (prevRecord: any, record: any, field: string) => boolean;
     /**
      * @hidden
      */
diff --git a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
index 259e621c056..308c6be4084 100644
--- a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
@@ -38,6 +38,7 @@ import { IDimensionsChange, IPivotConfiguration, IPivotDimension, IPivotKeys, IP
 import { IDataCloneStrategy } from '../../data-operations/data-clone-strategy';
 import { FormControl, FormGroup, ValidationErrors } from '@angular/forms';
 import { IgxGridValidationService } from '../grid/grid-validation.service';
+import { IGridMergeStrategy } from '../../data-operations/merge-strategy';
 
 export const IGX_GRID_BASE = /*@__PURE__*/new InjectionToken<GridType>('IgxGridBaseToken');
 export const IGX_GRID_SERVICE_BASE = /*@__PURE__*/new InjectionToken<GridServiceType>('IgxGridServiceBaseToken');
@@ -335,6 +336,7 @@ export interface ColumnType extends FieldType {
     /** @hidden @internal */
     headerCell: any;
     validators: any[];
+    mergingComparer: (prevRecord: any, record: any, field: string) => boolean;
 
     /**
      * The template reference for the custom header of the column
@@ -692,6 +694,7 @@ export interface GridType extends IGridDataBindable {
     /** Represents the locale of the grid: `USD`, `EUR`, `GBP`, `CNY`, `JPY`, etc. */
     locale: string;
     cellMergeMode: GridCellMergeMode;
+    mergeStrategy: IGridMergeStrategy;
     resourceStrings: IGridResourceStrings;
     /* blazorSuppress */
     /** Represents the native HTML element itself */
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index b5a0123f568..b2baeb1cc30 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -185,6 +185,7 @@ import { IgxGridValidationService } from './grid/grid-validation.service';
 import { getCurrentResourceStrings } from '../core/i18n/resources';
 import { isTree, recreateTree, recreateTreeFromFields } from '../data-operations/expressions-tree-util';
 import { getUUID } from './common/random';
+import { IGridMergeStrategy } from '../data-operations/merge-strategy';
 
 interface IMatchInfoCache {
     row: any;
@@ -2494,6 +2495,18 @@ export abstract class IgxGridBaseDirective implements GridType,
         this._sortingStrategy = value;
     }
 
+
+    /**
+     * Gets/Sets the merge strategy of the grid.
+     *
+     * @example
+     * ```html
+     *  <igx-grid #grid [data]="localData" [mergeStrategy]="mergeStrategy"></igx-grid>
+     * ```
+     */
+    @Input()
+    public mergeStrategy: IGridMergeStrategy;
+
     /**
      * Gets/Sets the sorting options - single or multiple sorting.
      * Accepts an `ISortingOptions` object with any of the `mode` properties.
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 73d87e9c00d..43267186900 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -95,32 +95,11 @@ export class IgxGridCellMergePipe implements PipeTransform {
         if (columnToMerge.length === 0) {
             return collection;
         }
-        let prev = null;
-        let result = [];
-        for (const rec of collection) {
-            let recData = { recordRef: rec, cellMergeMeta: new Map<string, IMergeByResult>() };
-            for (const col of columnToMerge) {
-                    recData.cellMergeMeta.set(col.field, { rowSpan: 1 });
-                    //TODO condition can be a strategy or some callback that the user can set.
-                    if ( prev && prev.recordRef[col.field] === rec[col.field]) {
-                        const root = prev.cellMergeMeta.get(col.field)?.root ?? prev;
-                        root.cellMergeMeta.get(col.field).rowSpan += 1;
-                        recData.cellMergeMeta.get(col.field).root = root;
-                    }
-            }
-            prev = recData;
-            result.push(recData);
-        }
+        const result = DataUtil.merge(cloneArray(collection), columnToMerge, this.grid.mergeStrategy, this.grid);
         return result;
     }
 }
 
-export interface IMergeByResult {
-    rowSpan: number;
-    root?: any;
-    prev?: any;
-}
-
 /**
  * @hidden
  */
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index d61923064bf..38dde79226c 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -27,7 +27,6 @@ import { mergeWith } from 'lodash-es';
 import { Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
 import { trackByIdentity } from '../core/utils';
-import { IMergeByResult } from './grid/grid.pipes';
 
 @Directive({
     selector: '[igxRowBaseComponent]',
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index ca4bbb3d153..9d7d1814595 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -3,11 +3,11 @@ <h4 class="sample-title">Grid with cell merge</h4>
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>
         <div>
-            <button igxButton>Test</button>
-            @if (cell.row.index % 2 == 0) {
+            <button igxButton>Test {{val}}</button>
+            <!-- @if (cell.row.index % 2 == 0) {
                 <br/>
                 <button igxButton>Test 2</button>
-            }
+            } -->
 
         </div>
         </ng-template>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index 0d79c827d11..7443240d731 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -190,7 +190,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
     },
     {
-        ProductID: 1,
+        ProductID: 13,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 1,
@@ -203,7 +203,7 @@ export class GridCellMergingComponent {
         OrderDate: null,
         OrderDate2: new Date(1991, 2, 12, 18, 40, 50).toISOString()
     }, {
-        ProductID: 2,
+        ProductID: 14,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 1,
@@ -217,7 +217,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 3,
+        ProductID: 15,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 1,
@@ -231,7 +231,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 4,
+        ProductID: 16,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 1,
@@ -245,7 +245,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 5,
+        ProductID: 17,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 1,
@@ -259,7 +259,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 6,
+        ProductID: 18,
         ProductName: 'Chang',
         SupplierID: 1,
         CategoryID: 1,
@@ -273,7 +273,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 7,
+        ProductID: 19,
         ProductName: 'Chang',
         SupplierID: 1,
         CategoryID: 1,
@@ -287,7 +287,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 8,
+        ProductID: 20,
         ProductName: 'Chang',
         SupplierID: 1,
         CategoryID: 1,
@@ -301,7 +301,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date('2003-03-17').toISOString()
     },
     {
-        ProductID: 9,
+        ProductID: 21,
         ProductName: 'Aniseed Syrup',
         SupplierID: 1,
         CategoryID: 2,
@@ -315,7 +315,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
     },
     {
-        ProductID: 10,
+        ProductID: 22,
         ProductName: 'Chang',
         SupplierID: 1,
         CategoryID: 2,
@@ -329,7 +329,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
     },
     {
-        ProductID: 11,
+        ProductID: 23,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 2,
@@ -343,7 +343,7 @@ export class GridCellMergingComponent {
         OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
     },
     {
-        ProductID: 12,
+        ProductID: 24,
         ProductName: 'Chai',
         SupplierID: 1,
         CategoryID: 2,

From 13619527242455f4da928093c97ec0c63b7bec48 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 9 Jul 2025 13:12:20 +0300
Subject: [PATCH 10/54] chore(*): Adjust pipe triggers.

---
 .../src/lib/grids/grid/grid.component.html                | 2 +-
 .../igniteui-angular/src/lib/grids/grid/grid.pipes.ts     | 8 +++-----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index fc0df2e4644..3af125f1e03 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -89,7 +89,7 @@
         | gridDetails:hasDetails:expansionStates:pipeTrigger
         | gridAddRow:false:pipeTrigger
         | gridRowPinning:id:false:pipeTrigger
-        | gridCellMerge:pipeTrigger"
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight"
             [igxForItemSize]="hasColumnLayouts ? rowHeight * multiRowLayoutRowSize + 1 : renderedRowHeight"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 43267186900..77d52bcbad1 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -5,7 +5,7 @@ import { IGroupByExpandState } from '../../data-operations/groupby-expand-state.
 import { IGroupByResult } from '../../data-operations/grouping-result.interface';
 import { IFilteringExpressionsTree, FilteringExpressionsTree } from '../../data-operations/filtering-expressions-tree';
 import { IGroupingExpression } from '../../data-operations/grouping-expression.interface';
-import { GridType, IGX_GRID_BASE } from '../common/grid.interface';
+import { ColumnType, GridType, IGX_GRID_BASE } from '../common/grid.interface';
 import { FilterUtil, IFilteringStrategy } from '../../data-operations/filtering-strategy';
 import { ISortingExpression } from '../../data-operations/sorting-strategy';
 import { IGridSortingStrategy, IGridGroupingStrategy } from '../common/strategy';
@@ -85,10 +85,8 @@ export class IgxGridCellMergePipe implements PipeTransform {
 
     constructor(@Inject(IGX_GRID_BASE) private grid: GridType) { }
 
-    public transform(collection: any, _pipeTrigger: number) {
-        const mergeMode = this.grid.cellMergeMode;
-        const sortExpr = this.grid.sortingExpressions;
-        const columnToMerge = this.grid.visibleColumns.filter(
+    public transform(collection: any, visibleColumns: ColumnType[], mergeMode: GridCellMergeMode, sortExpr: ISortingExpression[], _pipeTrigger: number) {
+        const columnToMerge = visibleColumns.filter(
             x => x.merge && (mergeMode ==='always' ||
             (mergeMode === 'onSort' && !!sortExpr.find( x=> x.fieldName === x.fieldName)))
         );

From 407357f5e58adcd6eb26a18d9d11cdae605cad88 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 9 Jul 2025 14:42:42 +0300
Subject: [PATCH 11/54] chore(*):  Re-use cell templates.

---
 .../src/lib/grids/common/pipes.ts             |  3 +-
 .../src/lib/grids/grid-base.directive.ts      |  2 +-
 .../lib/grids/grid/grid-row.component.html    | 42 +++----------------
 .../src/lib/grids/grid/grid.component.html    | 14 +++----
 .../src/lib/grids/grid/grid.component.ts      |  5 ++-
 .../hierarchical-grid.component.html          |  4 +-
 .../pivot-grid/pivot-grid.component.html      |  2 +-
 .../src/lib/grids/row.directive.ts            | 10 ++++-
 .../grids/tree-grid/tree-grid.component.html  |  4 +-
 .../grid-cellMerging.component.html           |  6 ++-
 .../grid-cellMerging.component.ts             |  4 +-
 11 files changed, 39 insertions(+), 57 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/common/pipes.ts b/projects/igniteui-angular/src/lib/grids/common/pipes.ts
index 371245c96ad..27d0667fbeb 100644
--- a/projects/igniteui-angular/src/lib/grids/common/pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/pipes.ts
@@ -115,6 +115,7 @@ export class IgxGridRowClassesPipe implements PipeTransform {
         dragging: boolean,
         index: number,
         mrl: boolean,
+        merged: boolean,
         filteredOut: boolean,
         _rowData: any,
         _: number
@@ -126,7 +127,7 @@ export class IgxGridRowClassesPipe implements PipeTransform {
             [dirty, 'igx-grid__tr--edited'],
             [deleted, 'igx-grid__tr--deleted'],
             [dragging, 'igx-grid__tr--drag'],
-            [mrl || _rowData.cellMergeMeta, 'igx-grid__tr--mrl'],
+            [mrl || merged, 'igx-grid__tr--mrl'],
             // Tree grid only
             [filteredOut, 'igx-grid__tr--filtered']
         ];
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index b2baeb1cc30..44db042c792 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3662,7 +3662,7 @@ export abstract class IgxGridBaseDirective implements GridType,
      * @internal
      */
     public isRecordMerged(rec) {
-        return rec.cellMergeMeta;
+        return rec?.cellMergeMeta;
     }
 
     public getMergeCellOffset(rec) {
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index 0489078ac7d..dd1eac61f3f 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -32,13 +32,13 @@
         }
         <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]="grid.unpinnedWidth" [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]="grid.trackColumnChanges" #igxDirRef>
             @if (this.hasMergedCells) {
-                <div [style.height.px]=" this.data.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
+                <div [style.height.px]=" this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
                      class="igx-grid__mrl-block"
-                     [style.visibility]="this.data.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
+                     [style.visibility]="this.metaData.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
                      [ngStyle]="{
-                    'grid-template-rows': this.data.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
+                    'grid-template-rows': this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
                 }">
-                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : mergedCellTemplate; context: getContext(col, this)"></ng-container>
+                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
             </div>
             }
             @else {
@@ -108,6 +108,7 @@
 
 <ng-template #cellTemplate let-col>
     <igx-grid-cell
+        [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
         class="igx-grid__td igx-grid__td--fw"
         [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
         [class.igx-grid__td--pinned]="col.pinned"
@@ -142,6 +143,7 @@
 
 <ng-template #expandableCellTemplate let-col>
     <igx-expandable-grid-cell
+        [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
         [class.igx-grid__td--pinned]="col.pinned"
         class="igx-grid__td igx-grid__td--fw igx-grid__td--tree-cell"
         [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
@@ -171,38 +173,6 @@
     </igx-expandable-grid-cell>
 </ng-template>
 
-<ng-template #mergedCellTemplate let-col>
-    <igx-grid-cell
-    class="igx-grid__td igx-grid__td--fw"
-    [class.igx-grid__td--merged]="data.cellMergeMeta.get(col.field)?.rowSpan > 1"
-    [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
-    [class.igx-grid__td--pinned]="col.pinned"
-    [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
-    [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-    [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-    [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
-    [column]="col"
-    [lastPinned]="col.columnLayoutChild ? null : col.isLastPinned"
-    [firstPinned]="col.columnLayoutChild ? null : col.isFirstPinned"
-    [formatter]="col.formatter"
-    [intRow]="this"
-    [rowData]="data.recordRef"
-    [visibleColumnIndex]="col.visibleIndex"
-    [value]="data.recordRef | dataMapper:col.field:grid.pipeTrigger:data.recordRef[col.field]:col.hasNestedPath"
-    [cellTemplate]="col.bodyTemplate"
-    [cellValidationErrorTemplate]="col.errorTemplate"
-    [lastSearchInfo]="grid.lastSearchInfo"
-    [active]="isCellActive(col.visibleIndex)"
-    [cellSelectionMode]="grid.cellSelection"
-    [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-    [style.min-width]="col.resolvedWidth"
-    [style.max-width]="col.resolvedWidth"
-    [style.flex-basis]="col.resolvedWidth"
-    [width]="col.getCellWidth()"
-    #cell>
-</igx-grid-cell>
-</ng-template>
-
 <ng-template #mrlCellTemplate let-col>
     <igx-grid-cell
         class="igx-grid__td igx-grid__td--fw"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 3af125f1e03..2f84f207d22 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -50,8 +50,8 @@
 
 
         @for (rowData of mergedData; track rowData; let rowIndex = $index) {
-            <igx-grid-row [style.background]="'red'" [style.position]="'absolute'" [gridID]="id" [index]="rowIndex" [data]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
-            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+            <igx-grid-row [style.position]="'absolute'" [gridID]="id" [index]="rowIndex" [data]="rowData.recordRef" [metaData]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
+            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
             [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-grid-row>
         }
@@ -105,15 +105,15 @@
         </ng-template>
         <ng-container *ngTemplateOutlet="hasPinnedRecords && !isRowPinningToTop ? pinnedRecordsTemplate : null">
         </ng-container>
-        <ng-template #record_template let-rowIndex="index" let-rowData let-disabledRow="disabled">
-            <igx-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData" [disabled]="disabledRow"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+        <ng-template #record_template let-rowIndex="index" let-rowData let-disabledRow="disabled" let-metaData="metaData">
+            <igx-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData" [disabled]="disabledRow" [metaData]="metaData"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-grid-row>
         </ng-template>
-        <ng-template #pinned_record_template let-rowIndex="index" let-rowData>
+        <ng-template #pinned_record_template let-rowIndex="index" let-rowData let-metaData="metaData">
             <igx-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger"#row #pinnedRow>
             </igx-grid-row>
         </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index d1d0a3fa116..8395d09cf5e 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -960,13 +960,14 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
             }
         }
         return {
-            $implicit: this.isGhostRecord(rowData) ? rowData.recordRef : rowData,
+            $implicit: this.isGhostRecord(rowData) || this.isRecordMerged(rowData) ? rowData.recordRef : rowData,
             index: this.getDataViewIndex(rowIndex, pinned),
             templateID: {
                 type: this.isGroupByRecord(rowData) ? 'groupRow' : this.isSummaryRow(rowData) ? 'summaryRow' : 'dataRow',
                 id: null
             },
-            disabled: this.isGhostRecord(rowData)
+            disabled: this.isGhostRecord(rowData),
+            metaData: rowData
         };
     }
 
diff --git a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
index d5f31ada6b4..59be7cefe5b 100644
--- a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
@@ -75,14 +75,14 @@
         </ng-template>
         <ng-template #hierarchical_record_template let-rowIndex="index" let-disabledRow="disabled" let-rowData>
             <igx-hierarchical-grid-row [gridID]="id" [index]="rowIndex" [disabled]="disabledRow" [data]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-hierarchical-grid-row>
         </ng-template>
 
         <ng-template #pinned_hierarchical_record_template let-rowIndex="index" let-rowData>
             <igx-hierarchical-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row #pinnedRow>
             </igx-hierarchical-grid-row>
         </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.html b/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.html
index 9ca659192f9..95089b96554 100644
--- a/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.html
@@ -52,7 +52,7 @@
         </ng-template>
         <ng-template #record_template let-rowIndex="index" let-rowData>
             <igx-pivot-row [gridID]="id" [index]="rowIndex" [data]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:false:rowData:pipeTrigger"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-pivot-row>
         </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 38dde79226c..d4e4b6ae5c6 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -45,6 +45,12 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
     @HostBinding('attr.role')
     public role = 'row';
 
+    /**
+     * @hidden
+     */
+    @Input()
+    public metaData: any;
+
     /**
      *  The data passed to the row component.
      *
@@ -118,7 +124,7 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
     }
 
     public get hasMergedCells(): boolean {
-            return this.grid.isRecordMerged(this.data);
+            return this.grid.isRecordMerged(this.metaData);
     }
 
     /**
@@ -597,7 +603,7 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
     }
 
     protected getMergeCellSpan(col: ColumnType){
-        const rowCount = this.data.cellMergeMeta.get(col.field).rowSpan;
+        const rowCount = this.metaData.cellMergeMeta.get(col.field).rowSpan;
         let sizeSpans = "";
         for (let index = this.index; index < this.index + rowCount; index++) {
             const size = this.grid.verticalScrollContainer.getSizeAt(index);
diff --git a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
index 2521cc28e58..5db61b5629c 100644
--- a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
@@ -78,13 +78,13 @@
         <ng-container *ngTemplateOutlet="hasPinnedRecords && !isRowPinningToTop ? pinnedRecordsTemplate : null"></ng-container>
         <ng-template #record_template let-rowIndex="index" let-disabledRow="disabled" let-rowData>
             <igx-tree-grid-row [gridID]="id" [index]="rowIndex" [treeRow]="rowData" [disabled]="disabledRow"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-tree-grid-row>
         </ng-template>
         <ng-template #pinned_record_template let-rowIndex="index" let-rowData>
             <igx-tree-grid-row [gridID]="id" [index]="rowIndex" [treeRow]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger"#row #pinnedRow>
             </igx-tree-grid-row>
         </ng-template>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 9d7d1814595..da15f25881d 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,5 +1,5 @@
 <h4 class="sample-title">Grid with cell merge</h4>
-<igx-grid [data]="data" width="800px" height="550px" [moving]="true" [cellMergeMode]="'always'" >
+<igx-grid [data]="data" width="800px" height="550px" [primaryKey]="'ProductID'" [moving]="true" [cellMergeMode]="'always'" >
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>
         <div>
@@ -12,7 +12,7 @@ <h4 class="sample-title">Grid with cell merge</h4>
         </div>
         </ng-template>
     </igx-column>
-    <igx-column field="ReorderLevel" width="200px" [merge]="true">
+    <igx-column field="ReorderLevel" width="200px" [merge]="true" editable="true">
     </igx-column>
     <igx-column required field="ProductName" width="200px" [merge]="true">
     </igx-column>
@@ -20,4 +20,6 @@ <h4 class="sample-title">Grid with cell merge</h4>
     </igx-column>
     <igx-column field="OrderDate" width="200px">
     </igx-column>
+    <igx-paginator [perPage]="20">
+    </igx-paginator>
 </igx-grid>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index 7443240d731..527180f1a09 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -5,6 +5,7 @@ import {
     IgxCellTemplateDirective,
     IgxColumnComponent,
     IgxGridComponent,
+    IgxPaginatorComponent,
 } from 'igniteui-angular';
 
 import { data, dataWithoutPK } from '../shared/data';
@@ -18,7 +19,8 @@ import { data, dataWithoutPK } from '../shared/data';
         IgxColumnComponent,
         IgxGridComponent,
         IgxCellTemplateDirective,
-        IgxButtonDirective
+        IgxButtonDirective,
+        IgxPaginatorComponent
     ]
 })
 export class GridCellMergingComponent {

From f23dd6cf4ed5915851605635c4c541d9397acdde Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 9 Jul 2025 14:51:01 +0300
Subject: [PATCH 12/54] chore(*): Fix row indexes in merged row area.

---
 .../igniteui-angular/src/lib/grids/grid/grid.component.html     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 2f84f207d22..fdb8366e80b 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -50,7 +50,7 @@
 
 
         @for (rowData of mergedData; track rowData; let rowIndex = $index) {
-            <igx-grid-row [style.position]="'absolute'" [gridID]="id" [index]="rowIndex" [data]="rowData.recordRef" [metaData]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
+            <igx-grid-row [style.position]="'absolute'" [gridID]="id" [index]="this.verticalScrollContainer.igxForOf.indexOf(rowData)" [data]="rowData.recordRef" [metaData]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
             [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
             [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-grid-row>

From f6ffa428065517c39a3168dd4260468c29463dce Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 9 Jul 2025 18:22:03 +0300
Subject: [PATCH 13/54] chore(*): Adjust some styles for row selection.

---
 .../core/styles/components/grid/_grid-theme.scss   | 14 ++++++++++++++
 .../grid-cellMerging.component.html                |  2 +-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
index 47123b240b3..37d8794db01 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
@@ -1825,6 +1825,20 @@
         color: var-get($theme, 'row-selected-text-color');
         background: var-get($theme, 'row-selected-background');
 
+        &%grid-row--mrl {
+            background: transparent;
+            %grid-mrl-block {
+                color: var-get($theme, 'row-selected-text-color');
+                background: var-get($theme, 'row-selected-background');
+                %igx-grid__td--merged {
+                    color: var-get($theme, 'row-selected-text-color');
+                    background: var-get($theme, 'row-selected-background');
+                }
+            }
+        }
+
+
+
         %grid-cell--selected,
         %grid-cell--pinned-selected {
             color: var-get($theme, 'cell-selected-within-text-color');
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index da15f25881d..21d28741a49 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,5 +1,5 @@
 <h4 class="sample-title">Grid with cell merge</h4>
-<igx-grid [data]="data" width="800px" height="550px" [primaryKey]="'ProductID'" [moving]="true" [cellMergeMode]="'always'" >
+<igx-grid [data]="data" width="800px" height="550px" [primaryKey]="'ProductID'" [moving]="true" [cellMergeMode]="'always'" [rowSelection]="'single'" >
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>
         <div>

From 4d1b981a518b1a430903b35c4d3c02029a8b4807 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 10 Jul 2025 16:15:28 +0300
Subject: [PATCH 14/54] chore(*): Merged cells navigation.

---
 .../src/lib/grids/grid-base.directive.ts      |  18 +++
 .../grids/grid-merge-navigation.service.ts    | 108 ++++++++++++++++++
 .../src/lib/grids/grid/grid.component.ts      |   3 +-
 .../src/lib/grids/row.directive.ts            |   6 +
 4 files changed, 134 insertions(+), 1 deletion(-)
 create mode 100644 projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 44db042c792..e9d3ec5710c 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -186,6 +186,7 @@ import { getCurrentResourceStrings } from '../core/i18n/resources';
 import { isTree, recreateTree, recreateTreeFromFields } from '../data-operations/expressions-tree-util';
 import { getUUID } from './common/random';
 import { IGridMergeStrategy } from '../data-operations/merge-strategy';
+import { IgxGridMergeNavigationService } from './grid-merge-navigation.service';
 
 interface IMatchInfoCache {
     row: any;
@@ -3984,6 +3985,23 @@ export abstract class IgxGridBaseDirective implements GridType,
         if (this.actionStrip) {
             this.actionStrip.menuOverlaySettings.outlet = this.outlet;
         }
+        this._setupNavigationService();
+    }
+
+    protected _setupNavigationService() {
+        if (this.hasCellsToMerge) {
+            this.navigation = new IgxGridMergeNavigationService(this.platform);
+            this.navigation.grid = this;
+        }
+    }
+
+    protected get hasCellsToMerge() {
+        const columnToMerge = this.visibleColumns.filter(
+            x => x.merge && (this.cellMergeMode ==='always' ||
+            (this.cellMergeMode === 'onSort' && !!this.sortingExpressions
+                .find( x=> x.fieldName === x.fieldName)))
+        );
+        return columnToMerge.length > 0;
     }
 
     /**
diff --git a/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts b/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
new file mode 100644
index 00000000000..295f100a30d
--- /dev/null
+++ b/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
@@ -0,0 +1,108 @@
+import { Injectable } from '@angular/core';
+import { IgxGridNavigationService } from './grid-navigation.service';
+import { first } from 'rxjs/operators';
+/** @hidden */
+@Injectable()
+export class IgxGridMergeNavigationService extends IgxGridNavigationService {
+    public override shouldPerformVerticalScroll(targetRowIndex: number, visibleColIndex: number): boolean {
+        const targetRec = this.grid.verticalScrollContainer.igxForOf[targetRowIndex];
+        const field = this.grid.visibleColumns[visibleColIndex]?.field;
+        const rowSpan = targetRec?.cellMergeMeta?.get(field)?.rowSpan;
+        if (rowSpan > 1) {
+            const targetRow = super.getRowElementByIndex(targetRowIndex);
+            const containerHeight = this.grid.calcHeight ? Math.ceil(this.grid.calcHeight) : 0;
+            const scrollPos = this.getVerticalScrollPositions(targetRowIndex, rowSpan);
+            return (!targetRow || targetRow.offsetTop < Math.abs(this.containerTopOffset)
+                || containerHeight && containerHeight < scrollPos.rowBottom -  Math.ceil(this.scrollTop));
+        } else {
+            return super.shouldPerformVerticalScroll(targetRowIndex, visibleColIndex);
+        }
+    }
+
+    public override performVerticalScrollToCell(rowIndex: number, visibleColIndex: number, cb?: () => void) {
+        const targetRec = this.grid.verticalScrollContainer.igxForOf[rowIndex];
+        const field = this.grid.visibleColumns[visibleColIndex]?.field;
+        const rowSpan = targetRec?.cellMergeMeta?.get(field)?.rowSpan;
+        if (rowSpan > 1) {
+            const containerHeight = this.grid.calcHeight ? Math.ceil(this.grid.calcHeight) : 0;
+            const pos = this.getVerticalScrollPositions(rowIndex, rowSpan);
+            const row = super.getRowElementByIndex(rowIndex);
+            if ((this.scrollTop > pos.rowTop) && (!row || row.offsetTop < Math.abs(this.containerTopOffset))) {
+                if (pos.topOffset === 0) {
+                    this.grid.verticalScrollContainer.scrollTo(rowIndex);
+                } else {
+                    this.grid.verticalScrollContainer.scrollPosition = pos.rowTop;
+                }
+            } else {
+                this.grid.verticalScrollContainer.addScrollTop(Math.abs(pos.rowBottom - this.scrollTop - containerHeight));
+            }
+            this.grid.verticalScrollContainer.chunkLoad
+                .pipe(first()).subscribe(() => {
+                    if (cb) {
+                        cb();
+                    }
+            });
+        } else {
+            super.performVerticalScrollToCell(rowIndex, visibleColIndex, cb);
+        }
+    }
+
+    protected override getNextPosition(rowIndex: number, colIndex: number, key: string, shift: boolean, ctrl: boolean, event: KeyboardEvent) {
+
+        const field = this.grid.visibleColumns[colIndex]?.field;
+        switch (key) {
+            case 'tab':
+            case ' ':
+            case 'spacebar':
+            case 'space':
+            case 'escape':
+            case 'esc':
+            case 'enter':
+            case 'f2':
+            case 'left':
+            case 'arrowleft':
+            case 'arrowright':
+            case 'right':
+                // same as base for these keys
+                return super.getNextPosition(rowIndex, colIndex, key, shift, ctrl, event);
+                break;
+            case 'end':
+                rowIndex = ctrl ? this.findLastDataRowIndex() : this.activeNode.row;
+                colIndex = this.lastColumnIndex;
+                break;
+            case 'home':
+                rowIndex = ctrl ? this.findFirstDataRowIndex() : this.activeNode.row;
+                colIndex = 0;
+                break;
+            case 'arrowup':
+            case 'up':
+                const prevRec = this.grid.verticalScrollContainer.igxForOf[this.activeNode.row - 1];
+                const root = prevRec?.cellMergeMeta?.get(field)?.root;
+                const prev = this.activeNode.row - (root?.cellMergeMeta?.get(field).rowSpan || 1);
+                colIndex = this.activeNode.column !== undefined ? this.activeNode.column : 0;
+                rowIndex = ctrl ? this.findFirstDataRowIndex() : prev;
+                break;
+            case 'arrowdown':
+            case 'down':
+                const rec = this.grid.verticalScrollContainer.igxForOf[this.activeNode.row];
+                const next = this.activeNode.row + (rec?.cellMergeMeta?.get(field)?.rowSpan || 1);
+                colIndex = this.activeNode.column !== undefined ? this.activeNode.column : 0;
+                rowIndex = ctrl ? this.findLastDataRowIndex() : next;
+                break;
+            default:
+                return;
+        }
+        return { rowIndex, colIndex };
+    }
+
+    private getVerticalScrollPositions(rowIndex: number, rowSpan: number) {
+        const rowTop = this.grid.verticalScrollContainer.sizesCache[rowIndex];
+        const rowBottom = this.grid.verticalScrollContainer.sizesCache[rowIndex + rowSpan];
+        const topOffset = rowBottom - rowTop;
+        return { topOffset, rowTop, rowBottom };
+    }
+
+    private get scrollTop(): number {
+        return Math.abs(this.grid.verticalScrollContainer.getScroll().scrollTop);
+     }
+}
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index 8395d09cf5e..b3ea155bd0c 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -1357,11 +1357,12 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
         this._gridAPI.sort_groupBy_multiple(this._groupingExpressions);
     }
 
-    private _setupNavigationService() {
+    protected override _setupNavigationService() {
         if (this.hasColumnLayouts) {
             this.navigation = new IgxGridMRLNavigationService(this.platform);
             this.navigation.grid = this;
         }
+        super._setupNavigationService();
     }
 
     private checkIfNoColumnField(expression: IGroupingExpression | Array<IGroupingExpression> | any): boolean {
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index d4e4b6ae5c6..1cdcacc5c3e 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -522,6 +522,12 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
 
     public isCellActive(visibleColumnIndex) {
         const node = this.grid.navigation.activeNode;
+        const field = this.grid.visibleColumns[visibleColumnIndex].field;
+        const rowSpan = this.metaData?.cellMergeMeta?.get(field)?.rowSpan;
+        if (rowSpan > 1) {
+            return node ? (node.row >= this.index && node.row < this.index + rowSpan)
+             && node.column === visibleColumnIndex : false;
+        }
         return node ? node.row === this.index && node.column === visibleColumnIndex : false;
     }
 

From aca57ee8a9a9d0fb09c394654daeb8bed62e6d52 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 10 Jul 2025 17:03:50 +0300
Subject: [PATCH 15/54] chore(*): Adjust for scenarios after horizontal nav
 into merged cell.

---
 .../src/lib/grids/grid-merge-navigation.service.ts  | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts b/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
index 295f100a30d..870c26e34b5 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
@@ -48,8 +48,10 @@ export class IgxGridMergeNavigationService extends IgxGridNavigationService {
     }
 
     protected override getNextPosition(rowIndex: number, colIndex: number, key: string, shift: boolean, ctrl: boolean, event: KeyboardEvent) {
-
         const field = this.grid.visibleColumns[colIndex]?.field;
+        const currentRec = this.grid.verticalScrollContainer.igxForOf[this.activeNode.row];
+        const currentRootRec = currentRec?.cellMergeMeta?.get(field)?.root;
+        const currentIndex = currentRootRec ? this.grid.verticalScrollContainer.igxForOf.indexOf(currentRootRec) : this.activeNode.row;
         switch (key) {
             case 'tab':
             case ' ':
@@ -76,16 +78,15 @@ export class IgxGridMergeNavigationService extends IgxGridNavigationService {
                 break;
             case 'arrowup':
             case 'up':
-                const prevRec = this.grid.verticalScrollContainer.igxForOf[this.activeNode.row - 1];
-                const root = prevRec?.cellMergeMeta?.get(field)?.root;
-                const prev = this.activeNode.row - (root?.cellMergeMeta?.get(field).rowSpan || 1);
+                const prevRec = this.grid.verticalScrollContainer.igxForOf[currentIndex - 1];
+                const prevRoot = prevRec?.cellMergeMeta?.get(field)?.root;
+                const prev = currentIndex - (prevRoot?.cellMergeMeta?.get(field).rowSpan || 1);
                 colIndex = this.activeNode.column !== undefined ? this.activeNode.column : 0;
                 rowIndex = ctrl ? this.findFirstDataRowIndex() : prev;
                 break;
             case 'arrowdown':
             case 'down':
-                const rec = this.grid.verticalScrollContainer.igxForOf[this.activeNode.row];
-                const next = this.activeNode.row + (rec?.cellMergeMeta?.get(field)?.rowSpan || 1);
+                const next = currentIndex + ((currentRootRec || currentRec)?.cellMergeMeta?.get(field)?.rowSpan || 1);
                 colIndex = this.activeNode.column !== undefined ? this.activeNode.column : 0;
                 rowIndex = ctrl ? this.findLastDataRowIndex() : next;
                 break;

From e168c3a30ad05133a6eccc48a072bf2674fbeb08 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 10 Jul 2025 18:42:05 +0300
Subject: [PATCH 16/54] chore(*): Add integration with pinning.

---
 .../src/lib/data-operations/merge-strategy.ts          | 10 ++++++++++
 .../src/lib/grids/grid-base.directive.ts               |  6 +++++-
 .../src/lib/grids/grid/grid.component.ts               |  2 +-
 .../igniteui-angular/src/lib/grids/row.directive.ts    |  6 ++++--
 .../grid-cellMerging/grid-cellMerging.component.html   |  5 ++++-
 src/app/grid-cellMerging/grid-cellMerging.component.ts |  6 +++++-
 6 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index c9afd6fc3f9..183b29ed4c6 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -31,7 +31,17 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
         let prev = null;
         let index = 0;
         for (const rec of data) {
+
             const recData = result[index];
+            // if this is some special record type - add and skip merging
+            if (rec.ghostRecord) {
+                if(!recData) {
+                    result.push(rec);
+                }
+                prev = null;
+                index++;
+                continue;
+            }
             let recToUpdateData = recData ?? { recordRef: rec, cellMergeMeta: new Map<string, IMergeByResult>() };
             recToUpdateData.cellMergeMeta.set(field, { rowSpan: 1 });
             if (prev && comparer(prev.recordRef, recToUpdateData.recordRef, field)) {
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index e9d3ec5710c..a2a5116ce34 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3668,7 +3668,11 @@ export abstract class IgxGridBaseDirective implements GridType,
 
     public getMergeCellOffset(rec) {
         const index = this.verticalScrollContainer.igxForOf.indexOf(rec);
-        return -(this.verticalScrollContainer.scrollPosition - this.verticalScrollContainer.getScrollForIndex(index));
+        let offset = this.verticalScrollContainer.scrollPosition - this.verticalScrollContainer.getScrollForIndex(index);
+        if (this.hasPinnedRecords && this.isRowPinningToTop) {
+            offset -= this.pinnedRowHeight;
+        }
+        return -offset;
     }
 
     /**
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index b3ea155bd0c..e48438fad91 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -967,7 +967,7 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
                 id: null
             },
             disabled: this.isGhostRecord(rowData),
-            metaData: rowData
+            metaData: this.isRecordMerged(rowData) ? rowData : null
         };
     }
 
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 1cdcacc5c3e..94df28fb9f0 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -611,7 +611,8 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
     protected getMergeCellSpan(col: ColumnType){
         const rowCount = this.metaData.cellMergeMeta.get(col.field).rowSpan;
         let sizeSpans = "";
-        for (let index = this.index; index < this.index + rowCount; index++) {
+        const indexInData = this.grid.verticalScrollContainer.igxForOf.indexOf(this.metaData);
+        for (let index = indexInData; index < indexInData + rowCount; index++) {
             const size = this.grid.verticalScrollContainer.getSizeAt(index);
             sizeSpans += size + 'px ';
         }
@@ -619,7 +620,8 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
     }
 
     protected getRowHeight() {
-        const size = this.grid.verticalScrollContainer.getSizeAt(this.index) - 1;
+        const indexInData  = this.grid.verticalScrollContainer.igxForOf.indexOf(this.metaData);
+        const size = this.grid.verticalScrollContainer.getSizeAt(indexInData) - 1;
         return size || this.grid.rowHeight;
     }
 
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 21d28741a49..a98f0885a7a 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -3,7 +3,7 @@ <h4 class="sample-title">Grid with cell merge</h4>
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>
         <div>
-            <button igxButton>Test {{val}}</button>
+            <button igxButton>Test {{cell.row.index}}</button>
             <!-- @if (cell.row.index % 2 == 0) {
                 <br/>
                 <button igxButton>Test 2</button>
@@ -22,4 +22,7 @@ <h4 class="sample-title">Grid with cell merge</h4>
     </igx-column>
     <igx-paginator [perPage]="20">
     </igx-paginator>
+    <igx-action-strip>
+        <igx-grid-pinning-actions></igx-grid-pinning-actions>
+    </igx-action-strip>
 </igx-grid>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index 527180f1a09..eafeb96a269 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -1,10 +1,12 @@
 import { Component, HostBinding, ViewChild } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import {
+    IgxActionStripComponent,
     IgxButtonDirective,
     IgxCellTemplateDirective,
     IgxColumnComponent,
     IgxGridComponent,
+    IgxGridPinningActionsComponent,
     IgxPaginatorComponent,
 } from 'igniteui-angular';
 
@@ -20,7 +22,9 @@ import { data, dataWithoutPK } from '../shared/data';
         IgxGridComponent,
         IgxCellTemplateDirective,
         IgxButtonDirective,
-        IgxPaginatorComponent
+        IgxPaginatorComponent,
+        IgxActionStripComponent,
+        IgxGridPinningActionsComponent
     ]
 })
 export class GridCellMergingComponent {

From 02b866aa5f9f73f06c1ac027d05fd3a4e5f9bde4 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 11 Jul 2025 11:58:37 +0300
Subject: [PATCH 17/54] chore(*): Merge cells in pinned col.

---
 .../lib/grids/grid/grid-row.component.html    | 28 +++++++++++++++++--
 .../grid-cellMerging.component.html           |  7 +++++
 .../grid-cellMerging.component.ts             | 12 +++++++-
 3 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index dd1eac61f3f..5da5a1ef8b1 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -27,7 +27,19 @@
     @if (!grid.hasColumnLayouts) {
         @if (pinnedColumns.length > 0 && grid.isPinningToStart) {
             @for (col of pinnedColumns | igxNotGrouped; track trackPinnedColumn(col)) {
-                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+                @if (this.hasMergedCells) {
+                    <div [style.height.px]=" this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
+                         class="igx-grid__mrl-block"
+                         [style.visibility]="this.metaData.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
+                         [ngStyle]="{
+                        'grid-template-rows': this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
+                    }">
+                    <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+                </div>
+                }
+                @else {
+                    <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+                }
             }
         }
         <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]="grid.unpinnedWidth" [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]="grid.trackColumnChanges" #igxDirRef>
@@ -48,7 +60,19 @@
         </ng-template>
         @if (pinnedColumns.length > 0 && !grid.isPinningToStart) {
             @for (col of pinnedColumns | igxNotGrouped; track trackPinnedColumn(col)) {
-                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+                @if (this.hasMergedCells) {
+                    <div [style.height.px]=" this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
+                         class="igx-grid__mrl-block"
+                         [style.visibility]="this.metaData.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
+                         [ngStyle]="{
+                        'grid-template-rows': this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
+                    }">
+                    <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+                </div>
+                }
+                @else {
+                    <ng-container *ngTemplateOutlet="col.visibleIndex === 0 && grid.hasDetails ? expandableCellTemplate : cellTemplate; context: getContext(col, this)"></ng-container>
+                }
             }
         }
     }
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index a98f0885a7a..65132010ab4 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -25,4 +25,11 @@ <h4 class="sample-title">Grid with cell merge</h4>
     <igx-action-strip>
         <igx-grid-pinning-actions></igx-grid-pinning-actions>
     </igx-action-strip>
+    <igx-grid-toolbar>
+        <igx-grid-toolbar-actions>
+            <igx-grid-toolbar-hiding></igx-grid-toolbar-hiding>
+            <igx-grid-toolbar-pinning></igx-grid-toolbar-pinning>
+            <igx-grid-toolbar-exporter></igx-grid-toolbar-exporter>
+        </igx-grid-toolbar-actions>
+    </igx-grid-toolbar>
 </igx-grid>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index eafeb96a269..f60a23cd7a9 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -7,6 +7,11 @@ import {
     IgxColumnComponent,
     IgxGridComponent,
     IgxGridPinningActionsComponent,
+    IgxGridToolbarActionsComponent,
+    IgxGridToolbarComponent,
+    IgxGridToolbarExporterComponent,
+    IgxGridToolbarHidingComponent,
+    IgxGridToolbarPinningComponent,
     IgxPaginatorComponent,
 } from 'igniteui-angular';
 
@@ -24,7 +29,12 @@ import { data, dataWithoutPK } from '../shared/data';
         IgxButtonDirective,
         IgxPaginatorComponent,
         IgxActionStripComponent,
-        IgxGridPinningActionsComponent
+        IgxGridPinningActionsComponent,
+        IgxGridToolbarComponent,
+        IgxGridToolbarActionsComponent,
+        IgxGridToolbarPinningComponent,
+        IgxGridToolbarHidingComponent,
+        IgxGridToolbarExporterComponent
     ]
 })
 export class GridCellMergingComponent {

From d515e9715d5673ff50b30ee2c45261e8af573fe2 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 11 Jul 2025 13:32:02 +0300
Subject: [PATCH 18/54] chore(*): Adjust check for non-mergeable record types.

---
 .../igniteui-angular/src/lib/data-operations/data-util.ts | 2 +-
 .../src/lib/data-operations/merge-strategy.ts             | 8 +++++---
 src/app/grid-cellMerging/grid-cellMerging.component.html  | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/data-util.ts b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
index d3e66f19248..7b47eafc456 100644
--- a/projects/igniteui-angular/src/lib/data-operations/data-util.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
@@ -102,7 +102,7 @@ export class DataUtil {
     ): any[] {
         let result = [];
         for (const col of columns) {
-            strategy.merge(data, col.field, col.mergingComparer, result);
+            strategy.merge(data, col.field, col.mergingComparer, result, grid);
         }
         return result;
 }
diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index 183b29ed4c6..874b2ddf03a 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -10,7 +10,8 @@ export interface IGridMergeStrategy {
         data: any[],
         field: string,
         comparer: (prevRecord: any, currentRecord: any, field: string) => boolean,
-        result: any[]
+        result: any[],
+        grid?: GridType
     ) => any[];
 }
 
@@ -26,7 +27,8 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
         data: any[],
         field: string,
         comparer: (prevRecord: any, record: any, field: string) => boolean = this.comparer,
-        result: any[]
+        result: any[],
+        grid?: GridType
     ) {
         let prev = null;
         let index = 0;
@@ -34,7 +36,7 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
 
             const recData = result[index];
             // if this is some special record type - add and skip merging
-            if (rec.ghostRecord) {
+            if (grid && grid.isDetailRecord(rec) || grid.isGhostRecord(rec) || grid.isGroupByRecord(rec)) {
                 if(!recData) {
                     result.push(rec);
                 }
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 65132010ab4..0be130b991f 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -14,7 +14,7 @@ <h4 class="sample-title">Grid with cell merge</h4>
     </igx-column>
     <igx-column field="ReorderLevel" width="200px" [merge]="true" editable="true">
     </igx-column>
-    <igx-column required field="ProductName" width="200px" [merge]="true">
+    <igx-column required field="ProductName" width="200px" [merge]="true" groupable="true">
     </igx-column>
     <igx-column field="UnitsInStock" header="UnitsInStock" width="200px" [merge]="true">
     </igx-column>

From 95e5b40d9aafb79ac61d644a830840e8ef233c1f Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 11 Jul 2025 15:37:59 +0300
Subject: [PATCH 19/54] chore(*): Break merge sequence on row activation.
 Discard custom merge nav.

---
 .../src/lib/data-operations/data-util.ts      |   4 +-
 .../src/lib/data-operations/merge-strategy.ts |   6 +-
 .../src/lib/grids/grid-base.directive.ts      |  10 +-
 .../grids/grid-merge-navigation.service.ts    | 109 ------------------
 .../src/lib/grids/grid/grid.component.html    |   2 +-
 .../src/lib/grids/grid/grid.component.ts      |   3 +-
 .../src/lib/grids/grid/grid.pipes.ts          |   4 +-
 7 files changed, 13 insertions(+), 125 deletions(-)
 delete mode 100644 projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts

diff --git a/projects/igniteui-angular/src/lib/data-operations/data-util.ts b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
index 7b47eafc456..429321ffbef 100644
--- a/projects/igniteui-angular/src/lib/data-operations/data-util.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
@@ -98,11 +98,11 @@ export class DataUtil {
         return grouping.groupBy(data, state, grid, groupsRecords, fullResult);
     }
 
-    public static merge<T>(data: T[], columns: ColumnType[], strategy: IGridMergeStrategy = new DefaultMergeStrategy(), grid: GridType = null,
+    public static merge<T>(data: T[], columns: ColumnType[], strategy: IGridMergeStrategy = new DefaultMergeStrategy(), activeRowIndex = -1, grid: GridType = null,
     ): any[] {
         let result = [];
         for (const col of columns) {
-            strategy.merge(data, col.field, col.mergingComparer, result, grid);
+            strategy.merge(data, col.field, col.mergingComparer, result, activeRowIndex, grid);
         }
         return result;
 }
diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index 874b2ddf03a..ab79c5f8f64 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -11,6 +11,7 @@ export interface IGridMergeStrategy {
         field: string,
         comparer: (prevRecord: any, currentRecord: any, field: string) => boolean,
         result: any[],
+        activeRowIndex? : number,
         grid?: GridType
     ) => any[];
 }
@@ -28,6 +29,7 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
         field: string,
         comparer: (prevRecord: any, record: any, field: string) => boolean = this.comparer,
         result: any[],
+        activeRowIndex?: number,
         grid?: GridType
     ) {
         let prev = null;
@@ -35,8 +37,8 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
         for (const rec of data) {
 
             const recData = result[index];
-            // if this is some special record type - add and skip merging
-            if (grid && grid.isDetailRecord(rec) || grid.isGhostRecord(rec) || grid.isGroupByRecord(rec)) {
+            // if this is active row or some special record type - add and skip merging
+            if (activeRowIndex === index || (grid && grid.isDetailRecord(rec) || grid.isGhostRecord(rec) || grid.isGroupByRecord(rec))) {
                 if(!recData) {
                     result.push(rec);
                 }
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index a2a5116ce34..62d149740aa 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -186,7 +186,6 @@ import { getCurrentResourceStrings } from '../core/i18n/resources';
 import { isTree, recreateTree, recreateTreeFromFields } from '../data-operations/expressions-tree-util';
 import { getUUID } from './common/random';
 import { IGridMergeStrategy } from '../data-operations/merge-strategy';
-import { IgxGridMergeNavigationService } from './grid-merge-navigation.service';
 
 interface IMatchInfoCache {
     row: any;
@@ -3989,14 +3988,11 @@ export abstract class IgxGridBaseDirective implements GridType,
         if (this.actionStrip) {
             this.actionStrip.menuOverlaySettings.outlet = this.outlet;
         }
-        this._setupNavigationService();
     }
 
-    protected _setupNavigationService() {
-        if (this.hasCellsToMerge) {
-            this.navigation = new IgxGridMergeNavigationService(this.platform);
-            this.navigation.grid = this;
-        }
+
+    protected get activeRowIndex(){
+        return this.navigation.activeNode.row;
     }
 
     protected get hasCellsToMerge() {
diff --git a/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts b/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
deleted file mode 100644
index 870c26e34b5..00000000000
--- a/projects/igniteui-angular/src/lib/grids/grid-merge-navigation.service.ts
+++ /dev/null
@@ -1,109 +0,0 @@
-import { Injectable } from '@angular/core';
-import { IgxGridNavigationService } from './grid-navigation.service';
-import { first } from 'rxjs/operators';
-/** @hidden */
-@Injectable()
-export class IgxGridMergeNavigationService extends IgxGridNavigationService {
-    public override shouldPerformVerticalScroll(targetRowIndex: number, visibleColIndex: number): boolean {
-        const targetRec = this.grid.verticalScrollContainer.igxForOf[targetRowIndex];
-        const field = this.grid.visibleColumns[visibleColIndex]?.field;
-        const rowSpan = targetRec?.cellMergeMeta?.get(field)?.rowSpan;
-        if (rowSpan > 1) {
-            const targetRow = super.getRowElementByIndex(targetRowIndex);
-            const containerHeight = this.grid.calcHeight ? Math.ceil(this.grid.calcHeight) : 0;
-            const scrollPos = this.getVerticalScrollPositions(targetRowIndex, rowSpan);
-            return (!targetRow || targetRow.offsetTop < Math.abs(this.containerTopOffset)
-                || containerHeight && containerHeight < scrollPos.rowBottom -  Math.ceil(this.scrollTop));
-        } else {
-            return super.shouldPerformVerticalScroll(targetRowIndex, visibleColIndex);
-        }
-    }
-
-    public override performVerticalScrollToCell(rowIndex: number, visibleColIndex: number, cb?: () => void) {
-        const targetRec = this.grid.verticalScrollContainer.igxForOf[rowIndex];
-        const field = this.grid.visibleColumns[visibleColIndex]?.field;
-        const rowSpan = targetRec?.cellMergeMeta?.get(field)?.rowSpan;
-        if (rowSpan > 1) {
-            const containerHeight = this.grid.calcHeight ? Math.ceil(this.grid.calcHeight) : 0;
-            const pos = this.getVerticalScrollPositions(rowIndex, rowSpan);
-            const row = super.getRowElementByIndex(rowIndex);
-            if ((this.scrollTop > pos.rowTop) && (!row || row.offsetTop < Math.abs(this.containerTopOffset))) {
-                if (pos.topOffset === 0) {
-                    this.grid.verticalScrollContainer.scrollTo(rowIndex);
-                } else {
-                    this.grid.verticalScrollContainer.scrollPosition = pos.rowTop;
-                }
-            } else {
-                this.grid.verticalScrollContainer.addScrollTop(Math.abs(pos.rowBottom - this.scrollTop - containerHeight));
-            }
-            this.grid.verticalScrollContainer.chunkLoad
-                .pipe(first()).subscribe(() => {
-                    if (cb) {
-                        cb();
-                    }
-            });
-        } else {
-            super.performVerticalScrollToCell(rowIndex, visibleColIndex, cb);
-        }
-    }
-
-    protected override getNextPosition(rowIndex: number, colIndex: number, key: string, shift: boolean, ctrl: boolean, event: KeyboardEvent) {
-        const field = this.grid.visibleColumns[colIndex]?.field;
-        const currentRec = this.grid.verticalScrollContainer.igxForOf[this.activeNode.row];
-        const currentRootRec = currentRec?.cellMergeMeta?.get(field)?.root;
-        const currentIndex = currentRootRec ? this.grid.verticalScrollContainer.igxForOf.indexOf(currentRootRec) : this.activeNode.row;
-        switch (key) {
-            case 'tab':
-            case ' ':
-            case 'spacebar':
-            case 'space':
-            case 'escape':
-            case 'esc':
-            case 'enter':
-            case 'f2':
-            case 'left':
-            case 'arrowleft':
-            case 'arrowright':
-            case 'right':
-                // same as base for these keys
-                return super.getNextPosition(rowIndex, colIndex, key, shift, ctrl, event);
-                break;
-            case 'end':
-                rowIndex = ctrl ? this.findLastDataRowIndex() : this.activeNode.row;
-                colIndex = this.lastColumnIndex;
-                break;
-            case 'home':
-                rowIndex = ctrl ? this.findFirstDataRowIndex() : this.activeNode.row;
-                colIndex = 0;
-                break;
-            case 'arrowup':
-            case 'up':
-                const prevRec = this.grid.verticalScrollContainer.igxForOf[currentIndex - 1];
-                const prevRoot = prevRec?.cellMergeMeta?.get(field)?.root;
-                const prev = currentIndex - (prevRoot?.cellMergeMeta?.get(field).rowSpan || 1);
-                colIndex = this.activeNode.column !== undefined ? this.activeNode.column : 0;
-                rowIndex = ctrl ? this.findFirstDataRowIndex() : prev;
-                break;
-            case 'arrowdown':
-            case 'down':
-                const next = currentIndex + ((currentRootRec || currentRec)?.cellMergeMeta?.get(field)?.rowSpan || 1);
-                colIndex = this.activeNode.column !== undefined ? this.activeNode.column : 0;
-                rowIndex = ctrl ? this.findLastDataRowIndex() : next;
-                break;
-            default:
-                return;
-        }
-        return { rowIndex, colIndex };
-    }
-
-    private getVerticalScrollPositions(rowIndex: number, rowSpan: number) {
-        const rowTop = this.grid.verticalScrollContainer.sizesCache[rowIndex];
-        const rowBottom = this.grid.verticalScrollContainer.sizesCache[rowIndex + rowSpan];
-        const topOffset = rowBottom - rowTop;
-        return { topOffset, rowTop, rowBottom };
-    }
-
-    private get scrollTop(): number {
-        return Math.abs(this.grid.verticalScrollContainer.getScroll().scrollTop);
-     }
-}
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index fdb8366e80b..0f8fa519a68 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -89,7 +89,7 @@
         | gridDetails:hasDetails:expansionStates:pipeTrigger
         | gridAddRow:false:pipeTrigger
         | gridRowPinning:id:false:pipeTrigger
-        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:pipeTrigger"
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight"
             [igxForItemSize]="hasColumnLayouts ? rowHeight * multiRowLayoutRowSize + 1 : renderedRowHeight"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index e48438fad91..664a0a19289 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -1357,12 +1357,11 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
         this._gridAPI.sort_groupBy_multiple(this._groupingExpressions);
     }
 
-    protected override _setupNavigationService() {
+    protected _setupNavigationService() {
         if (this.hasColumnLayouts) {
             this.navigation = new IgxGridMRLNavigationService(this.platform);
             this.navigation.grid = this;
         }
-        super._setupNavigationService();
     }
 
     private checkIfNoColumnField(expression: IGroupingExpression | Array<IGroupingExpression> | any): boolean {
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 77d52bcbad1..b92e3f642cb 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -85,7 +85,7 @@ export class IgxGridCellMergePipe implements PipeTransform {
 
     constructor(@Inject(IGX_GRID_BASE) private grid: GridType) { }
 
-    public transform(collection: any, visibleColumns: ColumnType[], mergeMode: GridCellMergeMode, sortExpr: ISortingExpression[], _pipeTrigger: number) {
+    public transform(collection: any, visibleColumns: ColumnType[], mergeMode: GridCellMergeMode, sortExpr: ISortingExpression[], activeRowIndex: number, _pipeTrigger: number) {
         const columnToMerge = visibleColumns.filter(
             x => x.merge && (mergeMode ==='always' ||
             (mergeMode === 'onSort' && !!sortExpr.find( x=> x.fieldName === x.fieldName)))
@@ -93,7 +93,7 @@ export class IgxGridCellMergePipe implements PipeTransform {
         if (columnToMerge.length === 0) {
             return collection;
         }
-        const result = DataUtil.merge(cloneArray(collection), columnToMerge, this.grid.mergeStrategy, this.grid);
+        const result = DataUtil.merge(cloneArray(collection), columnToMerge, this.grid.mergeStrategy, activeRowIndex, this.grid);
         return result;
     }
 }

From 759b46545ed781e85d4e34e76c9a4d8a744e8b5d Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 11 Jul 2025 16:33:59 +0300
Subject: [PATCH 20/54] chore(*): Merge in pinned row area.

---
 .../src/lib/grids/grid-base.directive.ts                 | 2 +-
 .../src/lib/grids/grid/grid.component.html               | 9 +++++----
 projects/igniteui-angular/src/lib/grids/row.directive.ts | 5 +++--
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 62d149740aa..5a2335fade3 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3991,7 +3991,7 @@ export abstract class IgxGridBaseDirective implements GridType,
     }
 
 
-    protected get activeRowIndex(){
+    protected get activeRowIndex() {
         return this.navigation.activeNode.row;
     }
 
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 0f8fa519a68..0b85798d2d8 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -62,7 +62,8 @@
                 | gridAddRow:true:pipeTrigger
                 | gridRowPinning:id:true:pipeTrigger
                 | gridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger:true
-                | gridSort:sortingExpressions:groupingExpressions:sortStrategy:id:pipeTrigger:true; as pinnedData) {
+                | gridSort:sortingExpressions:groupingExpressions:sortStrategy:id:pipeTrigger:true
+                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger; as pinnedData) {
                 @if (pinnedData.length > 0) {
                     <div #pinContainer
                         [ngClass]="{
@@ -70,7 +71,7 @@
                             'igx-grid__tr--pinned-top': isRowPinningToTop
                         }"
                         class="igx-grid__tr--pinned" [style.width.px]="calcWidth">
-                        @for (rowData of pinnedData; track rowData; let rowIndex = $index) {
+                        @for (rowData of pinnedData; track (rowData.recordRef || rowData); let rowIndex = $index) {
                             <ng-container *ngTemplateOutlet="pinned_record_template; context: getContext(rowData, rowIndex, true)">
                             </ng-container>
                         }
@@ -89,7 +90,7 @@
         | gridDetails:hasDetails:expansionStates:pipeTrigger
         | gridAddRow:false:pipeTrigger
         | gridRowPinning:id:false:pipeTrigger
-        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger"
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:((hasPinnedRecords && isRowPinningToTop) ? activeRowIndex - pinnedRecordsCount : activeRowIndex):pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight"
             [igxForItemSize]="hasColumnLayouts ? rowHeight * multiRowLayoutRowSize + 1 : renderedRowHeight"
@@ -112,7 +113,7 @@
             </igx-grid-row>
         </ng-template>
         <ng-template #pinned_record_template let-rowIndex="index" let-rowData let-metaData="metaData">
-            <igx-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData"
+            <igx-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData" [metaData]="metaData"
                 [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger"#row #pinnedRow>
             </igx-grid-row>
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 94df28fb9f0..87d39f5c59a 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -608,10 +608,11 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         this.addAnimationEnd.emit(this);
     }
 
-    protected getMergeCellSpan(col: ColumnType){
+    protected getMergeCellSpan(col: ColumnType) {
         const rowCount = this.metaData.cellMergeMeta.get(col.field).rowSpan;
         let sizeSpans = "";
-        const indexInData = this.grid.verticalScrollContainer.igxForOf.indexOf(this.metaData);
+        const indexInData = this.pinned ? this.grid.getInitialPinnedIndex(this.data):
+        this.grid.verticalScrollContainer.igxForOf.indexOf(this.metaData);
         for (let index = indexInData; index < indexInData + rowCount; index++) {
             const size = this.grid.verticalScrollContainer.getSizeAt(index);
             sizeSpans += size + 'px ';

From 9329079977b9251ce5056ed970e7fa608e2c729b Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 14 Jul 2025 13:21:08 +0300
Subject: [PATCH 21/54] chore(*): Implement selection per spec.

---
 .../core/styles/components/grid/_grid-component.scss |  5 +++++
 .../lib/core/styles/components/grid/_grid-theme.scss |  6 +++++-
 .../src/lib/grids/grid/grid-row.component.html       |  1 +
 .../igniteui-angular/src/lib/grids/row.directive.ts  | 12 ++++++++++++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
index 93737fc219c..92e9238d8ff 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
@@ -300,6 +300,11 @@
             @extend %igx-grid__td--merged !optional;
         }
 
+
+        @include e(td, $m: merged-selected) {
+            @extend %igx-grid__td--merged-selected !optional;
+        }
+
         @include e(td, $m: editing) {
             @extend %igx-grid__td--editing !optional;
         }
diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
index 37d8794db01..376b9336c81 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
@@ -1826,7 +1826,6 @@
         background: var-get($theme, 'row-selected-background');
 
         &%grid-row--mrl {
-            background: transparent;
             %grid-mrl-block {
                 color: var-get($theme, 'row-selected-text-color');
                 background: var-get($theme, 'row-selected-background');
@@ -1891,6 +1890,11 @@
         grid-row: 1 / -1;
     }
 
+    %igx-grid__td--merged-selected {
+        color: var-get($theme, 'row-selected-text-color');
+        background: var-get($theme, 'row-selected-background');
+    }
+
     %igx-grid__tr--deleted {
         %grid-cell-text {
             font-style: italic;
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index 5da5a1ef8b1..9306a515fed 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -133,6 +133,7 @@
 <ng-template #cellTemplate let-col>
     <igx-grid-cell
         [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
+        [class.igx-grid__td--merged-selected]="isSelectionRoot(col)"
         class="igx-grid__td igx-grid__td--fw"
         [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
         [class.igx-grid__td--pinned]="col.pinned"
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 87d39f5c59a..ee40d1d31ee 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -620,6 +620,18 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         return `${sizeSpans}`;
     }
 
+    protected isSelectionRoot(col: ColumnType) {
+        const mergeMeta = this.metaData?.cellMergeMeta;
+        const rowCount = mergeMeta?.get(col.field)?.rowSpan;
+        if (mergeMeta && rowCount > 1) {
+            const indexInData = this.pinned && this.grid.isRowPinningToTop ? this.index - this.grid.pinnedRecordsCount : this.index;
+            const range = this.grid.verticalScrollContainer.igxForOf.slice(indexInData, indexInData + rowCount);
+            const inRange = range.filter(x => this.selectionService.isRowSelected(this.grid.primaryKey ? (x.recordRef || x)[this.grid.primaryKey] : (x.recordRef || x).recordRef)).length > 0;
+            return inRange;
+        }
+        return false;
+    }
+
     protected getRowHeight() {
         const indexInData  = this.grid.verticalScrollContainer.igxForOf.indexOf(this.metaData);
         const size = this.grid.verticalScrollContainer.getSizeAt(indexInData) - 1;

From 19c2efe2eb496a66a06872850f3e1dbc0d4f6651 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 14 Jul 2025 16:10:20 +0300
Subject: [PATCH 22/54] chore(*): Add hover styles.

---
 .../components/grid/_grid-component.scss      |  4 +++
 .../styles/components/grid/_grid-theme.scss   | 25 +++++++++++++++++--
 .../src/lib/grids/common/grid.interface.ts    |  2 ++
 .../src/lib/grids/grid-base.directive.ts      |  5 ++++
 .../lib/grids/grid/grid-row.component.html    |  1 +
 .../src/lib/grids/row.directive.ts            | 19 ++++++++++++++
 6 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
index 92e9238d8ff..92ab66cf5c9 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss
@@ -305,6 +305,10 @@
             @extend %igx-grid__td--merged-selected !optional;
         }
 
+        @include e(td, $m: merged-hovered) {
+            @extend %igx-grid__td--merged-hovered !optional;
+        }
+
         @include e(td, $m: editing) {
             @extend %igx-grid__td--editing !optional;
         }
diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
index 376b9336c81..bf9d1774dd5 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
@@ -1827,11 +1827,17 @@
 
         &%grid-row--mrl {
             %grid-mrl-block {
-                color: var-get($theme, 'row-selected-text-color');
-                background: var-get($theme, 'row-selected-background');
                 %igx-grid__td--merged {
                     color: var-get($theme, 'row-selected-text-color');
                     background: var-get($theme, 'row-selected-background');
+                    &:hover {
+                        background: var-get($theme, 'row-selected-hover-background');
+                        color: var-get($theme, 'row-selected-hover-text-color');
+                    }
+                    &%igx-grid__td--merged-hovered {
+                        background: var-get($theme, 'row-selected-hover-background');
+                        color: var-get($theme, 'row-selected-hover-text-color');
+                    }
                 }
             }
         }
@@ -1893,6 +1899,21 @@
     %igx-grid__td--merged-selected {
         color: var-get($theme, 'row-selected-text-color');
         background: var-get($theme, 'row-selected-background');
+
+        &%igx-grid__td--merged-hovered {
+            background: var-get($theme, 'row-selected-hover-background');
+            color: var-get($theme, 'row-selected-hover-text-color');
+        }
+    }
+
+    %igx-grid__td--merged-hovered {
+        background: var-get($theme, 'row-hover-background');
+        color: var-get($theme, 'row-hover-text-color');
+
+        &%igx-grid__td--merged-selected {
+            background: var-get($theme, 'row-selected-hover-background');
+            color: var-get($theme, 'row-selected-hover-text-color');
+        }
     }
 
     %igx-grid__tr--deleted {
diff --git a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
index 308c6be4084..2e690aa24fc 100644
--- a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
@@ -728,6 +728,8 @@ export interface GridType extends IGridDataBindable {
     isColumnWidthSum: boolean;
     /** @hidden @internal */
     minColumnWidth: number;
+    /** @hidden @internal */
+    hoverIndex?: number;
     /** Strategy, used for cloning the provided data. The type has one method, that takes any type of data */
     dataCloneStrategy: IDataCloneStrategy;
 
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 5a2335fade3..b68716b815d 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3099,6 +3099,11 @@ export abstract class IgxGridBaseDirective implements GridType,
      */
     public groupablePipeTrigger = 0;
 
+    /**
+     * @hidden @internal
+     */
+        public hoverIndex: number;
+
     /**
     * @hidden @internal
     */
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index 9306a515fed..b8e27a76e34 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -134,6 +134,7 @@
     <igx-grid-cell
         [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
         [class.igx-grid__td--merged-selected]="isSelectionRoot(col)"
+        [class.igx-grid__td--merged-hovered]="isHoveredRoot(col)"
         class="igx-grid__td igx-grid__td--fw"
         [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
         [class.igx-grid__td--pinned]="col.pinned"
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index ee40d1d31ee..6d9d734f7fb 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -632,6 +632,25 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         return false;
     }
 
+    @HostListener('mouseenter') onMouseEnter() {
+        this.grid.hoverIndex = this.index;
+      }
+
+      @HostListener('mouseleave') onMouseLeave() {
+        this.grid.hoverIndex = null;
+      }
+
+    protected isHoveredRoot(col: ColumnType) {
+        const mergeMeta = this.metaData?.cellMergeMeta;
+        const rowCount = mergeMeta?.get(col.field)?.rowSpan;
+        if (mergeMeta && rowCount > 1 && this.grid.hoverIndex !== null && this.grid.hoverIndex !== undefined) {
+            const indexInData = this.index;
+            const hoveredIndex = this.grid.hoverIndex;
+            return indexInData <= hoveredIndex && indexInData + rowCount > hoveredIndex;
+        }
+        return false;
+    }
+
     protected getRowHeight() {
         const indexInData  = this.grid.verticalScrollContainer.igxForOf.indexOf(this.metaData);
         const size = this.grid.verticalScrollContainer.getSizeAt(indexInData) - 1;

From 52860e85cccb0f3b0f3700b3fd0c95a464d931fd Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 14 Jul 2025 16:17:50 +0300
Subject: [PATCH 23/54] chore(*): Fix duplicate host listeners.

---
 .../igniteui-angular/src/lib/grids/row.directive.ts    | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 6d9d734f7fb..f094531c37f 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -441,6 +441,7 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         if (this.grid.actionStrip) {
             this.grid.actionStrip.show(this);
         }
+        this.grid.hoverIndex = this.index;
     }
 
     /**
@@ -452,6 +453,7 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         if (this.grid.actionStrip && this.grid.actionStrip.hideOnRowLeave) {
             this.grid.actionStrip.hide();
         }
+        this.grid.hoverIndex = null;
     }
 
     /**
@@ -632,14 +634,6 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         return false;
     }
 
-    @HostListener('mouseenter') onMouseEnter() {
-        this.grid.hoverIndex = this.index;
-      }
-
-      @HostListener('mouseleave') onMouseLeave() {
-        this.grid.hoverIndex = null;
-      }
-
     protected isHoveredRoot(col: ColumnType) {
         const mergeMeta = this.metaData?.cellMergeMeta;
         const rowCount = mergeMeta?.get(col.field)?.rowSpan;

From 16d4ac62320350582ddd4acf1a2244b5460aeca6 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 14 Jul 2025 17:32:41 +0300
Subject: [PATCH 24/54] chore(*): Merge ghost(pinned) records with same value
 in main area.

---
 .../src/lib/data-operations/merge-strategy.ts               | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index ab79c5f8f64..68db10b25ed 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -38,7 +38,7 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
 
             const recData = result[index];
             // if this is active row or some special record type - add and skip merging
-            if (activeRowIndex === index || (grid && grid.isDetailRecord(rec) || grid.isGhostRecord(rec) || grid.isGroupByRecord(rec))) {
+            if (activeRowIndex === index || (grid && grid.isDetailRecord(rec) || grid.isGroupByRecord(rec))) {
                 if(!recData) {
                     result.push(rec);
                 }
@@ -46,9 +46,9 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
                 index++;
                 continue;
             }
-            let recToUpdateData = recData ?? { recordRef: rec, cellMergeMeta: new Map<string, IMergeByResult>() };
+            let recToUpdateData = recData ?? { recordRef: grid.isGhostRecord(rec) ? rec.recordRef : rec, cellMergeMeta: new Map<string, IMergeByResult>(), ghostRecord: rec.ghostRecord };
             recToUpdateData.cellMergeMeta.set(field, { rowSpan: 1 });
-            if (prev && comparer(prev.recordRef, recToUpdateData.recordRef, field)) {
+            if (prev && comparer(prev.recordRef, recToUpdateData.recordRef, field) && prev.ghostRecord === recToUpdateData.ghostRecord) {
                 const root = prev.cellMergeMeta.get(field)?.root ?? prev;
                 root.cellMergeMeta.get(field).rowSpan += 1;
                 recToUpdateData.cellMergeMeta.get(field).root = root;

From f81bd27d680520b8638847876508e51c1934618b Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Tue, 15 Jul 2025 11:22:21 +0300
Subject: [PATCH 25/54] chore(*): Fix check for merged data.

---
 projects/igniteui-angular/src/lib/grids/grid/grid.component.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index 664a0a19289..8a3d618d5fd 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -391,11 +391,10 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
 
     public get mergedData() {
         const startIndex = this.verticalScrollContainer.state.startIndex;
-        const chunkSize = this.verticalScrollContainer.state.chunkSize;
         const mergeRecs = this.verticalScrollContainer.igxForOf?.filter((x, index) => {
             if (!x.cellMergeMeta) { return false;}
             const maxSpan = Math.max(...x.cellMergeMeta.values().toArray().map(x => x.rowSpan));
-           return startIndex > index && startIndex <= (index + maxSpan) && startIndex + chunkSize >= (index + maxSpan);
+           return startIndex > index && startIndex <= (index + maxSpan);
     });
         return mergeRecs;
     }

From 2ba947eeed5f01b8f4a6ffe4a2b64c1847f22b43 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Tue, 15 Jul 2025 12:27:52 +0300
Subject: [PATCH 26/54] chore(*): Refactor to calculate mergedData rows only on
 chunk change.

---
 .../src/lib/grids/common/grid.interface.ts    |  2 ++
 .../src/lib/grids/grid-base.directive.ts      | 25 +++++++++++++++++++
 .../src/lib/grids/grid/grid.component.html    |  2 +-
 .../src/lib/grids/grid/grid.component.ts      | 11 --------
 .../src/lib/grids/grid/grid.pipes.ts          |  9 +++----
 5 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
index 2e690aa24fc..c01f4cd1cd4 100644
--- a/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
+++ b/projects/igniteui-angular/src/lib/grids/common/grid.interface.ts
@@ -715,6 +715,8 @@ export interface GridType extends IGridDataBindable {
     pipeTrigger: number;
     summaryPipeTrigger: number;
     /** @hidden @internal */
+    columnsToMerge: ColumnType[],
+    /** @hidden @internal */
     groupablePipeTrigger: number;
     filteringPipeTrigger: number;
     /** @hidden @internal */
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index b68716b815d..0a78b628a26 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3230,6 +3230,7 @@ export abstract class IgxGridBaseDirective implements GridType,
     private _currentRowState: any;
     private _filteredSortedData = null;
     private _filteredData = null;
+    private _mergedDataInView = null;
 
     private _customDragIndicatorIconTemplate: TemplateRef<IgxGridEmptyTemplateContext>;
     private _excelStyleHeaderIconTemplate: TemplateRef<IgxGridHeaderTemplateContext>;
@@ -3855,6 +3856,19 @@ export abstract class IgxGridBaseDirective implements GridType,
             this.notifyChanges(true);
         });
 
+        this.verticalScrollContainer.chunkPreload.pipe(filter(() => !this._init), destructor).subscribe(() => {
+            // recalc merged data
+            if (this.columnsToMerge.length > 0) {
+                const startIndex = this.verticalScrollContainer.state.startIndex;
+                const prevDataView = this.verticalScrollContainer.igxForOf?.slice(0, startIndex);
+                this._mergedDataInView = prevDataView?.filter((x, index) => {
+                    if (!x.cellMergeMeta) { return false;}
+                    const maxSpan = Math.max(...x.cellMergeMeta.values().toArray().map(x => x.rowSpan));
+                   return startIndex <= (index + maxSpan);
+                });
+            }
+        });
+
         // notifier for column autosize requests
         this._autoSizeColumnsNotify.pipe(
             throttleTime(0, animationFrameScheduler, { leading: false, trailing: true }),
@@ -3928,6 +3942,17 @@ export abstract class IgxGridBaseDirective implements GridType,
         }
     }
 
+    public get columnsToMerge() : ColumnType[] {
+        return this.visibleColumns.filter(
+            x => x.merge && (this.cellMergeMode ==='always' ||
+            (this.cellMergeMode === 'onSort' && !!this.sortingExpressions.find( x=> x.fieldName === x.fieldName)))
+        );
+    }
+
+    protected get mergedDataInView() {
+        return this._mergedDataInView;
+    }
+
     /**
      * @hidden
      * @internal
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 0b85798d2d8..0d445f5cda3 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -49,7 +49,7 @@
         </ng-container>
 
 
-        @for (rowData of mergedData; track rowData; let rowIndex = $index) {
+        @for (rowData of mergedDataInView; track rowData; let rowIndex = $index) {
             <igx-grid-row [style.position]="'absolute'" [gridID]="id" [index]="this.verticalScrollContainer.igxForOf.indexOf(rowData)" [data]="rowData.recordRef" [metaData]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
             [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
             [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
index 8a3d618d5fd..7a670eff860 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.ts
@@ -389,17 +389,6 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
     private _groupByRowSelectorTemplate: TemplateRef<IgxGroupByRowSelectorTemplateContext>;
     private _detailTemplate;
 
-    public get mergedData() {
-        const startIndex = this.verticalScrollContainer.state.startIndex;
-        const mergeRecs = this.verticalScrollContainer.igxForOf?.filter((x, index) => {
-            if (!x.cellMergeMeta) { return false;}
-            const maxSpan = Math.max(...x.cellMergeMeta.values().toArray().map(x => x.rowSpan));
-           return startIndex > index && startIndex <= (index + maxSpan);
-    });
-        return mergeRecs;
-    }
-
-
     /**
      * Gets/Sets the array of data that populates the component.
      *
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index b92e3f642cb..dbfb9d676c1 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -86,14 +86,11 @@ export class IgxGridCellMergePipe implements PipeTransform {
     constructor(@Inject(IGX_GRID_BASE) private grid: GridType) { }
 
     public transform(collection: any, visibleColumns: ColumnType[], mergeMode: GridCellMergeMode, sortExpr: ISortingExpression[], activeRowIndex: number, _pipeTrigger: number) {
-        const columnToMerge = visibleColumns.filter(
-            x => x.merge && (mergeMode ==='always' ||
-            (mergeMode === 'onSort' && !!sortExpr.find( x=> x.fieldName === x.fieldName)))
-        );
-        if (columnToMerge.length === 0) {
+        const colsToMerge = this.grid.columnsToMerge;
+        if (colsToMerge.length=== 0) {
             return collection;
         }
-        const result = DataUtil.merge(cloneArray(collection), columnToMerge, this.grid.mergeStrategy, activeRowIndex, this.grid);
+        const result = DataUtil.merge(cloneArray(collection), colsToMerge, this.grid.mergeStrategy, activeRowIndex, this.grid);
         return result;
     }
 }

From 95d0186b49b2ec0a86c868d030876e772655550d Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Tue, 15 Jul 2025 12:41:04 +0300
Subject: [PATCH 27/54] chore(*): Cache merge data index and re-use in
 template.

---
 .../src/lib/grids/grid-base.directive.ts      | 19 ++++++++++++-------
 .../src/lib/grids/grid/grid.component.html    |  8 ++++----
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 0a78b628a26..b761204ba47 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3671,8 +3671,8 @@ export abstract class IgxGridBaseDirective implements GridType,
         return rec?.cellMergeMeta;
     }
 
-    public getMergeCellOffset(rec) {
-        const index = this.verticalScrollContainer.igxForOf.indexOf(rec);
+    public getMergeCellOffset(rowData) {
+        const index = rowData.index;
         let offset = this.verticalScrollContainer.scrollPosition - this.verticalScrollContainer.getScrollForIndex(index);
         if (this.hasPinnedRecords && this.isRowPinningToTop) {
             offset -= this.pinnedRowHeight;
@@ -3861,11 +3861,16 @@ export abstract class IgxGridBaseDirective implements GridType,
             if (this.columnsToMerge.length > 0) {
                 const startIndex = this.verticalScrollContainer.state.startIndex;
                 const prevDataView = this.verticalScrollContainer.igxForOf?.slice(0, startIndex);
-                this._mergedDataInView = prevDataView?.filter((x, index) => {
-                    if (!x.cellMergeMeta) { return false;}
-                    const maxSpan = Math.max(...x.cellMergeMeta.values().toArray().map(x => x.rowSpan));
-                   return startIndex <= (index + maxSpan);
-                });
+                const data = [];
+                for (let index = 0; index < startIndex; index++) {
+                    const rec = prevDataView[index];
+                    if (rec.cellMergeMeta &&
+                        // index + maxRowSpan is within view
+                        startIndex <= (index + Math.max(...rec.cellMergeMeta.values().toArray().map(x => x.rowSpan)))) {
+                            data.push({record: rec, index: index });
+                        }
+                }
+                this._mergedDataInView = data;
             }
         });
 
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 0d445f5cda3..04915e5f558 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -49,10 +49,10 @@
         </ng-container>
 
 
-        @for (rowData of mergedDataInView; track rowData; let rowIndex = $index) {
-            <igx-grid-row [style.position]="'absolute'" [gridID]="id" [index]="this.verticalScrollContainer.igxForOf.indexOf(rowData)" [data]="rowData.recordRef" [metaData]="rowData" [style.top.px]="getMergeCellOffset(rowData)"
-            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
-            [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
+        @for (rowData of mergedDataInView; track rowData.record;) {
+            <igx-grid-row [style.position]="'absolute'" [gridID]="id" [index]="rowData.index" [data]="rowData.record.recordRef" [metaData]="rowData.record" [style.top.px]="getMergeCellOffset(rowData)"
+            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowData.index:hasColumnLayouts:isRecordMerged(rowData):false:rowData.record:pipeTrigger"
+            [ngStyle]="rowStyles | igxGridRowStyles:rowData.record:rowData.index:pipeTrigger" #row>
             </igx-grid-row>
         }
         <ng-template #pinnedRecordsTemplate>

From 2a65bc272cd4f0384abcffd23080ed19bc69ae1b Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Tue, 15 Jul 2025 16:51:22 +0300
Subject: [PATCH 28/54] chore(*): Cell merge in hierarchical grid - initial
 commit.

---
 .../src/lib/data-operations/merge-strategy.ts |  2 +-
 .../src/lib/grids/grid-base.directive.ts      | 17 ++++-
 .../hierarchical-grid.component.html          | 27 ++++---
 .../hierarchical-grid.component.ts            | 12 ++--
 .../hierarchical-row.component.html           | 71 ++++++++++++-------
 .../grid-cellMerging.component.html           | 39 ++++++++--
 .../grid-cellMerging.component.ts             |  8 ++-
 7 files changed, 128 insertions(+), 48 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index 68db10b25ed..d18a6c43be5 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -38,7 +38,7 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
 
             const recData = result[index];
             // if this is active row or some special record type - add and skip merging
-            if (activeRowIndex === index || (grid && grid.isDetailRecord(rec) || grid.isGroupByRecord(rec))) {
+            if (activeRowIndex === index || (grid && grid.isDetailRecord(rec) || grid.isGroupByRecord(rec) || grid.isChildGridRecord(rec))) {
                 if(!recData) {
                     result.push(rec);
                 }
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index b761204ba47..a453a3af36c 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -2931,7 +2931,13 @@ export abstract class IgxGridBaseDirective implements GridType,
      */
     @WatchChanges()
     @Input()
-    public cellMergeMode: GridCellMergeMode = GridCellMergeMode.onSort;
+    public get cellMergeMode() {
+        return this._cellMergeMode;
+    }
+
+    public set cellMergeMode(value: GridCellMergeMode) {
+        this._cellMergeMode = value;
+    }
 
     /**
      * Gets/Sets row selection mode
@@ -3330,6 +3336,7 @@ export abstract class IgxGridBaseDirective implements GridType,
     private _sortDescendingHeaderIconTemplate: TemplateRef<IgxGridHeaderTemplateContext> = null;
     private _gridSize: Size = Size.Large;
     private _defaultRowHeight = 50;
+    private _cellMergeMode: GridCellMergeMode = GridCellMergeMode.onSort;
 
     /**
      * @hidden @internal
@@ -3568,6 +3575,14 @@ export abstract class IgxGridBaseDirective implements GridType,
         return false;
     }
 
+    /**
+     * @hidden
+     * @internal
+     */
+    public isChildGridRecord(_rec) {
+        return false;
+    }
+
     /**
      * @hidden @internal
      */
diff --git a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
index 59be7cefe5b..83f795de93d 100644
--- a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
@@ -31,6 +31,13 @@
                 [igxColumnMovingDrop]="headerContainer" [attr.droppable]="true" id="left"
                 class="igx-grid__scroll-on-drag-pinned" [style.left.px]="pinnedWidth"></span>
         }
+
+        @for (rowData of mergedDataInView; track rowData.record;) {
+            <igx-hierarchical-grid-row [style.position]="'absolute'" [gridID]="id" [index]="rowData.index" [data]="rowData.record.recordRef" [metaData]="rowData.record" [style.top.px]="getMergeCellOffset(rowData)"
+            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowData.index:hasColumnLayouts:isRecordMerged(rowData.record):false:rowData.record:pipeTrigger"
+            [ngStyle]="rowStyles | igxGridRowStyles:rowData.record:rowData.index:pipeTrigger" #row>
+            </igx-hierarchical-grid-row>
+        }
         <ng-template #pinnedRecordsTemplate>
             @if (data
                 | gridTransaction:id:pipeTrigger
@@ -38,13 +45,14 @@
                 | gridAddRow:true:pipeTrigger
                 | gridRowPinning:id:true:pipeTrigger
                 | gridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger:true
-                | gridSort:sortingExpressions:[]:sortStrategy:id:pipeTrigger:true; as pinnedData
+                | gridSort:sortingExpressions:[]:sortStrategy:id:pipeTrigger:true
+                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger; as pinnedData
             ) {
                 @if (pinnedData.length > 0) {
                     <div #pinContainer class="igx-grid__tr--pinned"
                         [ngClass]="{ 'igx-grid__tr--pinned-bottom':  !isRowPinningToTop, 'igx-grid__tr--pinned-top': isRowPinningToTop }"
                         [style.width.px]="calcWidth">
-                        @for (rowData of pinnedData; track rowData; let rowIndex = $index) {
+                        @for (rowData of pinnedData; track (rowData.recordRef || rowData); let rowIndex = $index) {
                             <ng-container *ngTemplateOutlet="pinned_hierarchical_record_template; context: getContext(rowData, rowIndex, true)">
                             </ng-container>
                         }
@@ -62,7 +70,8 @@
         | gridHierarchicalPaging:!!paginator:page:perPage:id:pipeTrigger
         | gridHierarchical:expansionStates:id:primaryKey:childLayoutKeys:pipeTrigger
         | gridAddRow:false:pipeTrigger
-        | gridRowPinning:id:false:pipeTrigger"
+        | gridRowPinning:id:false:pipeTrigger
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:((hasPinnedRecords && isRowPinningToTop) ? activeRowIndex - pinnedRecordsCount : activeRowIndex):pipeTrigger"
             [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight" [igxForItemSize]="renderedRowHeight" [igxForTrackBy]="trackChanges"
             #verticalScrollContainer (chunkPreload)="dataLoading($event)" (dataChanging)="dataRebinding($event)" (dataChanged)="dataRebound($event)">
@@ -73,16 +82,16 @@
             </ng-template>
             <!-- <ng-container *igxTemplateOutlet="(isHierarchicalRecord(rowData) ? hierarchical_record_template : (isChildGridRecord(rowData) && isExpanded(rowData) ? child_record_template : hierarchical_record_template)); context: getContext(rowData)"></ng-container> -->
         </ng-template>
-        <ng-template #hierarchical_record_template let-rowIndex="index" let-disabledRow="disabled" let-rowData>
-            <igx-hierarchical-grid-row [gridID]="id" [index]="rowIndex" [disabled]="disabledRow" [data]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
+        <ng-template #hierarchical_record_template let-rowIndex="index" let-disabledRow="disabled" let-rowData let-metaData="metaData">
+            <igx-hierarchical-grid-row [gridID]="id" [index]="rowIndex" [disabled]="disabledRow" [data]="rowData" [metaData]="metaData"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-hierarchical-grid-row>
         </ng-template>
 
-        <ng-template #pinned_hierarchical_record_template let-rowIndex="index" let-rowData>
-            <igx-hierarchical-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):false:rowData:pipeTrigger"
+        <ng-template #pinned_hierarchical_record_template let-rowIndex="index" let-rowData let-metaData="metaData">
+            <igx-hierarchical-grid-row [gridID]="id" [index]="rowIndex" [data]="rowData" [metaData]="metaData"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):false:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row #pinnedRow>
             </igx-hierarchical-grid-row>
         </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts
index 69695e21ee2..ea8a0a04543 100644
--- a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts
@@ -50,7 +50,7 @@ import { IgxGridValidationService } from '../grid/grid-validation.service';
 import { IgxGridHierarchicalPipe, IgxGridHierarchicalPagingPipe } from './hierarchical-grid.pipes';
 import { IgxSummaryDataPipe } from '../summaries/grid-root-summary.pipe';
 import { IgxGridTransactionPipe, IgxHasVisibleColumnsPipe, IgxGridRowPinningPipe, IgxGridAddRowPipe, IgxGridRowClassesPipe, IgxGridRowStylesPipe, IgxStringReplacePipe } from '../common/pipes';
-import { IgxGridSortingPipe, IgxGridFilteringPipe } from '../grid/grid.pipes';
+import { IgxGridSortingPipe, IgxGridFilteringPipe, IgxGridCellMergePipe } from '../grid/grid.pipes';
 import { IgxGridColumnResizerComponent } from '../resizing/resizer.component';
 import { IgxRowEditTabStopDirective } from '../grid.rowEdit.directive';
 import { IgxIconComponent } from '../../icon/icon.component';
@@ -350,7 +350,8 @@ export class IgxChildGridRowComponent implements AfterViewInit, OnInit {
         IgxSummaryDataPipe,
         IgxGridHierarchicalPipe,
         IgxGridHierarchicalPagingPipe,
-        IgxStringReplacePipe
+        IgxStringReplacePipe,
+        IgxGridCellMergePipe
     ],
     schemas: [CUSTOM_ELEMENTS_SCHEMA]
 })
@@ -942,7 +943,7 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
     /**
      * @hidden
      */
-    public isChildGridRecord(record: any): boolean {
+    public override isChildGridRecord(record: any): boolean {
         // Can be null when there is defined layout but no child data was found
         return record?.childGridsData !== undefined;
     }
@@ -986,13 +987,14 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
             }
         } else {
             return {
-                $implicit: this.isGhostRecord(rowData) ? rowData.recordRef : rowData,
+                $implicit: this.isGhostRecord(rowData) || this.isRecordMerged(rowData) ? rowData.recordRef : rowData,
                 templateID: {
                     type: 'dataRow',
                     id: null
                 },
                 index: this.getDataViewIndex(rowIndex, pinned),
-                disabled: this.isGhostRecord(rowData)
+                disabled: this.isGhostRecord(rowData),
+                metaData: this.isRecordMerged(rowData) ? rowData : null
             };
         }
     }
diff --git a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html
index 42d4a19c5d3..4c286034977 100644
--- a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html
@@ -54,32 +54,19 @@
     }
 
     <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" let-colIndex="index" [igxForSizePropName]='"calcPixelWidth"' [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]='grid.unpinnedWidth' [igxForTrackBy]='grid.trackColumnChanges' #igxDirRef>
-        <igx-hierarchical-grid-cell
-            class="igx-grid__td igx-grid__td--fw"
-            [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
-
-            [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
-            [class.igx-grid__td--bool]="col.dataType === 'boolean'"
-            [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-            [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-            [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
-            [column]="col"
-            [formatter]="col.formatter"
-            [intRow]="this"
-            [active]="isCellActive(col.visibleIndex)"
-            [rowData]="data"
-            [style.min-width]="col.resolvedWidth"
-            [style.max-width]="col.resolvedWidth"
-            [style.flex-basis]="col.resolvedWidth"
-            [width]="col.getCellWidth()"
-            [visibleColumnIndex]="col.visibleIndex"
-            [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
-            [cellTemplate]="col.bodyTemplate"
-            [cellValidationErrorTemplate]="col.errorTemplate"
-            [lastSearchInfo]="grid.lastSearchInfo"
-            [cellSelectionMode]="grid.cellSelection"
-            [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)">
-        </igx-hierarchical-grid-cell>
+        @if (this.hasMergedCells) {
+            <div [style.height.px]=" this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
+                 class="igx-grid__mrl-block"
+                 [style.visibility]="this.metaData.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
+                 [ngStyle]="{
+                'grid-template-rows': this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
+            }">
+                <ng-container *ngTemplateOutlet="cellTemplate; context: { $implicit: this, column: col }"></ng-container>
+            </div>
+        }
+        @else {
+            <ng-container *ngTemplateOutlet="cellTemplate; context: { $implicit: this, column: col }"></ng-container>
+        }
     </ng-template>
 
     @if (pinnedColumns.length > 0 && !grid.isPinningToStart) {
@@ -132,3 +119,35 @@
         }
     </ng-template>
 </ng-template>
+
+<ng-template #cellTemplate let-col="column">
+    <igx-hierarchical-grid-cell
+    [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
+    [class.igx-grid__td--merged-selected]="isSelectionRoot(col)"
+    [class.igx-grid__td--merged-hovered]="isHoveredRoot(col)"
+    class="igx-grid__td igx-grid__td--fw"
+    [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
+
+    [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
+    [class.igx-grid__td--bool]="col.dataType === 'boolean'"
+    [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+    [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+    [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
+    [column]="col"
+    [formatter]="col.formatter"
+    [intRow]="this"
+    [active]="isCellActive(col.visibleIndex)"
+    [rowData]="data"
+    [style.min-width]="col.resolvedWidth"
+    [style.max-width]="col.resolvedWidth"
+    [style.flex-basis]="col.resolvedWidth"
+    [width]="col.getCellWidth()"
+    [visibleColumnIndex]="col.visibleIndex"
+    [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
+    [cellTemplate]="col.bodyTemplate"
+    [cellValidationErrorTemplate]="col.errorTemplate"
+    [lastSearchInfo]="grid.lastSearchInfo"
+    [cellSelectionMode]="grid.cellSelection"
+    [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)">
+</igx-hierarchical-grid-cell>
+</ng-template>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 0be130b991f..f73e2c33de8 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,15 +1,16 @@
 <h4 class="sample-title">Grid with cell merge</h4>
-<igx-grid [data]="data" width="800px" height="550px" [primaryKey]="'ProductID'" [moving]="true" [cellMergeMode]="'always'" [rowSelection]="'single'" >
+<igx-grid [data]="data" width="800px" height="550px" [primaryKey]="'ProductID'" [moving]="true"
+    [cellMergeMode]="'always'" [rowSelection]="'single'">
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>
-        <div>
-            <button igxButton>Test {{cell.row.index}}</button>
-            <!-- @if (cell.row.index % 2 == 0) {
+            <div>
+                <button igxButton>Test {{cell.row.index}}</button>
+                <!-- @if (cell.row.index % 2 == 0) {
                 <br/>
                 <button igxButton>Test 2</button>
             } -->
 
-        </div>
+            </div>
         </ng-template>
     </igx-column>
     <igx-column field="ReorderLevel" width="200px" [merge]="true" editable="true">
@@ -33,3 +34,31 @@ <h4 class="sample-title">Grid with cell merge</h4>
         </igx-grid-toolbar-actions>
     </igx-grid-toolbar>
 </igx-grid>
+
+<h4 class="sample-title">Hierarchical grid with cell merge</h4>
+
+<igx-hierarchical-grid #hierarchicalGrid [height]="'550px'" [data]="hierarchicalData" [autoGenerate]="false"
+    [allowAdvancedFiltering]="true" [cellMergeMode]="'always'">
+    <igx-grid-toolbar></igx-grid-toolbar>
+    <igx-column field="EmployeeID" width="200px">
+    </igx-column>
+    <igx-column field="FirstName" width="200px">
+    </igx-column>
+    <igx-column field="LastName" width="200px">
+    </igx-column>
+    <igx-column field="Title" width="200px" [merge]="true"  [hasSummary]="true">
+    </igx-column>
+    <igx-column field="City" width="200px" [merge]="true" editable="true" sortable="true">
+    </igx-column>
+    <igx-row-island [key]="'Orders'" [cellMergeMode]="'always'">
+        <igx-column field="CustomerID" width="200px">
+        </igx-column>
+        <igx-column field="ShipName" width="200px">
+        </igx-column>
+        <igx-column field="ShipCountry" width="200px" [merge]="true" sortable="true">
+        </igx-column>
+        <igx-column field="ShipCity" width="200px" [merge]="true" sortable="true">
+        </igx-column>
+
+    </igx-row-island>
+</igx-hierarchical-grid>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index f60a23cd7a9..e44ce6a7179 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -12,8 +12,11 @@ import {
     IgxGridToolbarExporterComponent,
     IgxGridToolbarHidingComponent,
     IgxGridToolbarPinningComponent,
+    IgxHierarchicalGridComponent,
     IgxPaginatorComponent,
+    IgxRowIslandComponent,
 } from 'igniteui-angular';
+import { HIERARCHICAL_DATA } from '../shared/hierarchicalData';
 
 import { data, dataWithoutPK } from '../shared/data';
 
@@ -34,10 +37,13 @@ import { data, dataWithoutPK } from '../shared/data';
         IgxGridToolbarActionsComponent,
         IgxGridToolbarPinningComponent,
         IgxGridToolbarHidingComponent,
-        IgxGridToolbarExporterComponent
+        IgxGridToolbarExporterComponent,
+        IgxHierarchicalGridComponent,
+        IgxRowIslandComponent
     ]
 })
 export class GridCellMergingComponent {
+    public hierarchicalData = HIERARCHICAL_DATA.concat(HIERARCHICAL_DATA).concat(HIERARCHICAL_DATA);
     public data = [{
         ProductID: 1,
         ProductName: 'Chai',

From 5c4587fb89e879df1e0e46e33c3ed66696fafaa4 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 16 Jul 2025 12:45:33 +0300
Subject: [PATCH 29/54] chore(*): Implement for tree grid. Add 2 strategies.

---
 .../src/lib/data-operations/merge-strategy.ts |  41 ++++
 .../src/lib/grids/grid-base.directive.ts      |  13 +-
 .../tree-grid/tree-grid-row.component.html    | 223 ++++++++----------
 .../grids/tree-grid/tree-grid.component.html  |  26 +-
 .../grids/tree-grid/tree-grid.component.ts    |  11 +-
 .../grid-cellMerging.component.html           |  13 +-
 .../grid-cellMerging.component.ts             |   6 +-
 7 files changed, 194 insertions(+), 139 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index d18a6c43be5..4d20587775e 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -79,3 +79,44 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
         return a === b;
     }
 }
+
+
+export class DefaultTreeGridMergeStrategy extends DefaultMergeStrategy {
+    /* blazorSuppress */
+    public override comparer(prevRecord: any, record: any, field: string): boolean {
+        const a = prevRecord.data[field];
+        const b = record.data[field];
+        const an = (a === null || a === undefined);
+        const bn = (b === null || b === undefined);
+        if (an) {
+            if (bn) {
+                return true;
+            }
+            return false;
+        } else if (bn) {
+            return false;
+        }
+        return a === b;
+    }
+}
+
+export class ByLevelTreeGridMergeStrategy extends DefaultMergeStrategy {
+    /* blazorSuppress */
+    public override comparer(prevRecord: any, record: any, field: string): boolean {
+        const a = prevRecord.data[field];
+        const b = record.data[field];
+        const levelA = prevRecord.level;
+        const levelB = record.level;
+        const an = (a === null || a === undefined);
+        const bn = (b === null || b === undefined);
+        if (an) {
+            if (bn) {
+                return true;
+            }
+            return false;
+        } else if (bn) {
+            return false;
+        }
+        return a === b && levelA === levelB;
+    }
+}
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index a453a3af36c..97a625a806e 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -185,7 +185,7 @@ import { IgxGridValidationService } from './grid/grid-validation.service';
 import { getCurrentResourceStrings } from '../core/i18n/resources';
 import { isTree, recreateTree, recreateTreeFromFields } from '../data-operations/expressions-tree-util';
 import { getUUID } from './common/random';
-import { IGridMergeStrategy } from '../data-operations/merge-strategy';
+import { DefaultMergeStrategy, IGridMergeStrategy } from '../data-operations/merge-strategy';
 
 interface IMatchInfoCache {
     row: any;
@@ -2505,7 +2505,12 @@ export abstract class IgxGridBaseDirective implements GridType,
      * ```
      */
     @Input()
-    public mergeStrategy: IGridMergeStrategy;
+    get mergeStrategy() {
+        return this._mergeStrategy;
+    }
+    set  mergeStrategy(value) {
+        this._mergeStrategy = value;
+    }
 
     /**
      * Gets/Sets the sorting options - single or multiple sorting.
@@ -3181,6 +3186,10 @@ export abstract class IgxGridBaseDirective implements GridType,
     protected _columnPinning = false;
 
     protected _pinnedRecordIDs = [];
+    /**
+     * @hidden
+     */
+    protected _mergeStrategy: IGridMergeStrategy = new DefaultMergeStrategy();
 
     /**
      * @hidden
diff --git a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html
index 05bbb9e49c4..fd1fa6737fb 100644
--- a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html
@@ -23,66 +23,19 @@
         <ng-container *ngTemplateOutlet="pinnedCellsTemplate; context: this"></ng-container>
     }
     <ng-template igxGridFor let-col [igxGridForOf]="unpinnedColumns | igxNotGrouped" [igxForScrollContainer]="grid.parentVirtDir" let-colIndex="index" [igxForScrollOrientation]="'horizontal'" [igxForContainerSize]='grid.unpinnedWidth' [igxForSizePropName]="'calcPixelWidth'" [igxForTrackBy]='grid.trackColumnChanges' #igxDirRef>
-        <ng-template #cellTemplate>
-            <igx-grid-cell
-                class="igx-grid__td igx-grid__td--fw"
-                [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
-                [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
-                [class.igx-grid__td--bool]="col.dataType === 'boolean'"
-                [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
-                [column]="col"
-                [formatter]="col.formatter"
-                [intRow]="this"
-                [rowData]="data"
-                [style.min-width]="col.resolvedWidth"
-                [style.max-width]="col.resolvedWidth"
-                [style.flex-basis]="col.resolvedWidth"
-                [width]="col.getCellWidth()"
-                [visibleColumnIndex]="col.visibleIndex"
-                [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
-                [cellTemplate]="col.bodyTemplate"
-                [cellValidationErrorTemplate]="col.errorTemplate"
-                [lastSearchInfo]="grid.lastSearchInfo"
-                [active]="isCellActive(col.visibleIndex)"
-                [cellSelectionMode]="grid.cellSelection"
-                [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-                #treeCell>
-            </igx-grid-cell>
-        </ng-template>
-        <ng-template #treeCellTemplate>
-            <igx-tree-grid-cell
-                class="igx-grid__td igx-grid__td--fw igx-grid__td--tree-cell"
-                [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
-                [class.igx-grid__td--number]="(col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency') && col.visibleIndex !== 0"
-                [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [level]="treeRow.level"
-                [expanded]="expanded"
-                [showIndicator]="showIndicator"
-                [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
-                [column]="col"
-                [formatter]="col.formatter"
-                [intRow]="this"
-                [rowData]="data"
-                [style.min-width]="col.resolvedWidth"
-                [style.max-width]="col.resolvedWidth"
-                [style.flex-basis]="col.resolvedWidth"
-                [width]="col.getCellWidth()"
-                [visibleColumnIndex]="col.visibleIndex"
-                [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
-                [isLoading]="isLoading"
-                [cellTemplate]="col.bodyTemplate"
-                [cellValidationErrorTemplate]="col.errorTemplate"
-                [lastSearchInfo]="grid.lastSearchInfo"
-                [active]="isCellActive(col.visibleIndex)"
-                [cellSelectionMode]="grid.cellSelection"
-                [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-                #treeCell>
-            </igx-tree-grid-cell>
-        </ng-template>
-        <ng-container *ngTemplateOutlet="col.visibleIndex === 0 ? treeCellTemplate : cellTemplate"></ng-container>
+        @if (this.hasMergedCells) {
+            <div [style.height.px]=" this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
+                 class="igx-grid__mrl-block"
+                 [style.visibility]="this.metaData.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
+                 [ngStyle]="{
+                'grid-template-rows': this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
+            }">
+                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 ? treeCellTemplate : cellTemplate; context: { $implicit: this, column: col }"></ng-container>
+            </div>
+        }
+        @else {
+            <ng-container *ngTemplateOutlet="col.visibleIndex === 0 ? treeCellTemplate : cellTemplate; context: { $implicit: this, column: col }"></ng-container>
+        }
     </ng-template>
     @if (pinnedColumns.length > 0 && !grid.isPinningToStart) {
         <ng-container *ngTemplateOutlet="pinnedCellsTemplate; context: this"></ng-container>
@@ -106,69 +59,91 @@
 
 <ng-template #pinnedCellsTemplate let-col>
     @for (col of pinnedColumns | igxNotGrouped; track trackPinnedColumn(col)) {
-        <ng-template #cellTemplate>
-            <igx-grid-cell
-                class="igx-grid__td igx-grid__td--fw igx-grid__td--pinned"
-                [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
-                [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
-                [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
-                [column]="col"
-                [formatter]="col.formatter"
-                [intRow]="this"
-                [firstPinned]="col.isFirstPinned"
-                [lastPinned]="col.isLastPinned"
-                [rowData]="data"
-                [style.min-width]="col.resolvedWidth"
-                [style.max-width]="col.resolvedWidth"
-                [style.flex-basis]="col.resolvedWidth"
-                [style.left]="col.rightPinnedOffset"
-                [width]="col.getCellWidth()"
-                [visibleColumnIndex]="col.visibleIndex"
-                [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
-                [cellTemplate]="col.bodyTemplate"
-                [cellValidationErrorTemplate]="col.errorTemplate"
-                [lastSearchInfo]="grid.lastSearchInfo"
-                [active]="isCellActive(col.visibleIndex)"
-                [cellSelectionMode]="grid.cellSelection"
-                [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-                #treeCell>
-            </igx-grid-cell>
-        </ng-template>
-        <ng-template #treeCellTemplate>
-            <igx-tree-grid-cell
-                class="igx-grid__td igx-grid__td--fw igx-grid__td--tree-cell igx-grid__td--pinned"
-                [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
-                [class.igx-grid__td--number]="(col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency') && col.visibleIndex !== 0"
-                [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
-                [level]="treeRow.level"
-                [expanded]="expanded"
-                [showIndicator]="showIndicator"
-                [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
-                [column]="col"
-                [formatter]="col.formatter"
-                [intRow]="this"
-                [lastPinned]="col.isLastPinned"
-                [rowData]="data"
-                [style.min-width]="col.resolvedWidth"
-                [style.max-width]="col.resolvedWidth"
-                [style.flex-basis]="col.resolvedWidth"
-                [style.left]="col.rightPinnedOffset"
-                [width]="col.getCellWidth()"
-                [visibleColumnIndex]="col.visibleIndex"
-                [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
-                [isLoading]="isLoading"
-                [cellTemplate]="col.bodyTemplate"
-                [cellValidationErrorTemplate]="col.errorTemplate"
-                [lastSearchInfo]="grid.lastSearchInfo"
-                [active]="isCellActive(col.visibleIndex)"
-                [cellSelectionMode]="grid.cellSelection"
-                [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
-                #treeCell>
-            </igx-tree-grid-cell>
-        </ng-template>
-        <ng-container *ngTemplateOutlet="col.visibleIndex === 0 ? treeCellTemplate : cellTemplate"></ng-container>
+        @if (this.hasMergedCells) {
+            <div [style.height.px]=" this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? getRowHeight() : null"
+                 class="igx-grid__mrl-block"
+                 [style.visibility]="this.metaData.cellMergeMeta.get(col.field)?.root ? 'hidden' : 'visible'"
+                 [ngStyle]="{
+                'grid-template-rows': this.metaData.cellMergeMeta.get(col.field)?.rowSpan > 1 ? this.getMergeCellSpan(col) : null
+            }">
+                <ng-container *ngTemplateOutlet="col.visibleIndex === 0 ? treeCellTemplate : cellTemplate; context: { $implicit: this, column: col }"></ng-container>
+            </div>
+        }
+        @else {
+            <ng-container *ngTemplateOutlet="col.visibleIndex === 0 ? treeCellTemplate : cellTemplate; context: { $implicit: this, column: col }"></ng-container>
+        }
     }
 </ng-template>
+
+<ng-template #cellTemplate let-col="column">
+    <igx-grid-cell
+        [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
+        [class.igx-grid__td--merged-selected]="isSelectionRoot(col)"
+        [class.igx-grid__td--merged-hovered]="isHoveredRoot(col)"
+        [class.igx-grid__td--pinned]="col.pinned"
+        class="igx-grid__td igx-grid__td--fw"
+        [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
+        [class.igx-grid__td--number]="col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency'"
+        [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+        [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+        [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
+        [column]="col"
+        [formatter]="col.formatter"
+        [intRow]="this"
+        [firstPinned]="col.isFirstPinned"
+        [lastPinned]="col.isLastPinned"
+        [rowData]="data"
+        [style.min-width]="col.resolvedWidth"
+        [style.max-width]="col.resolvedWidth"
+        [style.flex-basis]="col.resolvedWidth"
+        [style.left]="col.rightPinnedOffset"
+        [width]="col.getCellWidth()"
+        [visibleColumnIndex]="col.visibleIndex"
+        [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
+        [cellTemplate]="col.bodyTemplate"
+        [cellValidationErrorTemplate]="col.errorTemplate"
+        [lastSearchInfo]="grid.lastSearchInfo"
+        [active]="isCellActive(col.visibleIndex)"
+        [cellSelectionMode]="grid.cellSelection"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        #treeCell>
+    </igx-grid-cell>
+</ng-template>
+<ng-template #treeCellTemplate let-col="column">
+    <igx-tree-grid-cell
+        class="igx-grid__td igx-grid__td--fw igx-grid__td--tree-cell"
+        [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
+        [class.igx-grid__td--merged-selected]="isSelectionRoot(col)"
+        [class.igx-grid__td--merged-hovered]="isHoveredRoot(col)"
+        [class.igx-grid__td--pinned]="col.pinned"
+        [class.igx-grid__td--edited]="key | transactionState:col.field:grid.rowEditable:grid.transactions:grid.pipeTrigger:grid.gridAPI.crudService.cell:grid.gridAPI.crudService.row"
+        [class.igx-grid__td--number]="(col.dataType === 'number' || col.dataType === 'percent' || col.dataType === 'currency') && col.visibleIndex !== 0"
+        [ngClass]="col.cellClasses | igxCellStyleClasses:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+        [ngStyle]="col.cellStyles | igxCellStyles:data[col.field]:data:col.field:viewIndex:grid.pipeTrigger"
+        [level]="treeRow.level"
+        [expanded]="expanded"
+        [showIndicator]="showIndicator"
+        [editMode]="col.editable && this.grid.crudService.targetInEdit(index, col.index)"
+        [column]="col"
+        [formatter]="col.formatter"
+        [intRow]="this"
+        [lastPinned]="col.isLastPinned"
+        [rowData]="data"
+        [style.min-width]="col.resolvedWidth"
+        [style.max-width]="col.resolvedWidth"
+        [style.flex-basis]="col.resolvedWidth"
+        [style.left]="col.rightPinnedOffset"
+        [width]="col.getCellWidth()"
+        [visibleColumnIndex]="col.visibleIndex"
+        [value]="data | dataMapper:col.field:grid.pipeTrigger:data[col.field]:col.hasNestedPath"
+        [isLoading]="isLoading"
+        [cellTemplate]="col.bodyTemplate"
+        [cellValidationErrorTemplate]="col.errorTemplate"
+        [lastSearchInfo]="grid.lastSearchInfo"
+        [active]="isCellActive(col.visibleIndex)"
+        [cellSelectionMode]="grid.cellSelection"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        #treeCell>
+    </igx-tree-grid-cell>
+</ng-template>
+
diff --git a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
index 5db61b5629c..3560107c5ce 100644
--- a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
@@ -30,6 +30,14 @@
                 [igxColumnMovingDrop]="headerContainer" [attr.droppable]="true" id="left"
                 class="igx-grid__scroll-on-drag-pinned" [style.left.px]="pinnedWidth"></span>
         }
+
+        @for (rowData of mergedDataInView; track rowData.record;) {
+            <igx-tree-grid-row [style.position]="'absolute'" [gridID]="id" [index]="rowData.index" [treeRow]="rowData.record.recordRef" [metaData]="rowData.record" [style.top.px]="getMergeCellOffset(rowData)"
+            [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowData.index:hasColumnLayouts:isRecordMerged(rowData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
+            [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowData.index:pipeTrigger" #row>
+        </igx-tree-grid-row>
+        }
+
         <ng-template #pinnedRecordsTemplate>
             @if (data
                 | treeGridTransaction:pipeTrigger
@@ -38,7 +46,8 @@
                 | treeGridAddRow:true:pipeTrigger
                 | gridRowPinning:id:true:pipeTrigger
                 | treeGridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:pipeTrigger:filteringPipeTrigger:true
-                | treeGridSorting:sortingExpressions:treeGroupArea?.expressions:sortStrategy:pipeTrigger:true; as pinnedData
+                | treeGridSorting:sortingExpressions:treeGroupArea?.expressions:sortStrategy:pipeTrigger:true
+                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger; as pinnedData
             ) {
                 @if (pinnedData.length > 0) {
                     <div #pinContainer
@@ -66,7 +75,8 @@
         | treeGridPaging:!!paginator:page:perPage:pipeTrigger
         | treeGridSummary:hasSummarizedColumns:summaryCalculationMode:summaryPosition:showSummaryOnCollapse:pipeTrigger:summaryPipeTrigger
         | treeGridAddRow:false:pipeTrigger
-        | gridRowPinning:id:false:pipeTrigger"
+        | gridRowPinning:id:false:pipeTrigger
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:((hasPinnedRecords && isRowPinningToTop) ? activeRowIndex - pinnedRecordsCount : activeRowIndex):pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]='verticalScroll'
             [igxForContainerSize]='calcHeight' [igxForItemSize]="renderedRowHeight" #verticalScrollContainer
             (dataChanging)="dataRebinding($event)" (dataChanged)="dataRebound($event)">
@@ -76,15 +86,15 @@
             </ng-template>
         </ng-template>
         <ng-container *ngTemplateOutlet="hasPinnedRecords && !isRowPinningToTop ? pinnedRecordsTemplate : null"></ng-container>
-        <ng-template #record_template let-rowIndex="index" let-disabledRow="disabled" let-rowData>
-            <igx-tree-grid-row [gridID]="id" [index]="rowIndex" [treeRow]="rowData" [disabled]="disabledRow"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
+        <ng-template #record_template let-rowIndex="index" let-disabledRow="disabled" let-rowData let-metaData="metaData">
+            <igx-tree-grid-row [gridID]="id" [index]="rowIndex" [treeRow]="rowData" [disabled]="disabledRow" [metaData]="metaData"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger" #row>
             </igx-tree-grid-row>
         </ng-template>
-        <ng-template #pinned_record_template let-rowIndex="index" let-rowData>
-            <igx-tree-grid-row [gridID]="id" [index]="rowIndex" [treeRow]="rowData"
-                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(rowData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
+        <ng-template #pinned_record_template let-rowIndex="index" let-rowData let-metaData="metaData">
+            <igx-tree-grid-row [gridID]="id" [index]="rowIndex" [treeRow]="rowData" [metaData]="metaData"
+                [ngClass]="rowClasses | igxGridRowClasses:row:row.inEditMode:row.selected:row.dirty:row.deleted:row.dragging:rowIndex:hasColumnLayouts:isRecordMerged(metaData):row.treeRow.isFilteredOutParent:rowData:pipeTrigger"
                 [ngStyle]="rowStyles | igxGridRowStyles:rowData:rowIndex:pipeTrigger"#row #pinnedRow>
             </igx-tree-grid-row>
         </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.ts b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.ts
index 30f413e00e4..32a424a37a7 100644
--- a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.ts
@@ -82,6 +82,8 @@ import { IgxGridDragSelectDirective } from '../selection/drag-select.directive';
 import { IgxGridBodyDirective } from '../grid.common';
 import { IgxGridHeaderRowComponent } from '../headers/grid-header-row.component';
 import { IgxTextHighlightService } from '../../directives/text-highlight/text-highlight.service';
+import { IgxGridCellMergePipe } from '../grid/grid.pipes';
+import { DefaultTreeGridMergeStrategy, IGridMergeStrategy } from '../../data-operations/merge-strategy';
 
 let NEXT_ID = 0;
 
@@ -168,7 +170,8 @@ let NEXT_ID = 0;
         IgxTreeGridSummaryPipe,
         IgxTreeGridNormalizeRecordsPipe,
         IgxTreeGridAddRowPipe,
-        IgxStringReplacePipe
+        IgxStringReplacePipe,
+        IgxGridCellMergePipe
     ],
     schemas: [CUSTOM_ELEMENTS_SCHEMA]
 })
@@ -348,6 +351,7 @@ export class IgxTreeGridComponent extends IgxGridBaseDirective implements GridTy
 
     protected override _filterStrategy = new TreeGridFilteringStrategy();
     protected override _transactions: HierarchicalTransactionService<HierarchicalTransaction, HierarchicalState>;
+    protected override _mergeStrategy: IGridMergeStrategy = new DefaultTreeGridMergeStrategy();
     private _data;
     private _rowLoadingIndicatorTemplate: TemplateRef<void>;
     private _expansionDepth = Infinity;
@@ -699,13 +703,14 @@ export class IgxTreeGridComponent extends IgxGridBaseDirective implements GridTy
      */
     public getContext(rowData: any, rowIndex: number, pinned?: boolean): any {
         return {
-            $implicit: this.isGhostRecord(rowData) ? rowData.recordRef : rowData,
+            $implicit: this.isGhostRecord(rowData) || this.isRecordMerged(rowData) ? rowData.recordRef : rowData,
             index: this.getDataViewIndex(rowIndex, pinned),
             templateID: {
                 type: this.isSummaryRow(rowData) ? 'summaryRow' : 'dataRow',
                 id: null
             },
-            disabled: this.isGhostRecord(rowData) ? rowData.recordRef.isFilteredOutParent === undefined : false
+            disabled: this.isGhostRecord(rowData) ? rowData.recordRef.isFilteredOutParent === undefined : false,
+            metaData: this.isRecordMerged(rowData) ? rowData : null
         };
     }
 
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index f73e2c33de8..5dd64944ae1 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -37,7 +37,7 @@ <h4 class="sample-title">Grid with cell merge</h4>
 
 <h4 class="sample-title">Hierarchical grid with cell merge</h4>
 
-<igx-hierarchical-grid #hierarchicalGrid [height]="'550px'" [data]="hierarchicalData" [autoGenerate]="false"
+<igx-hierarchical-grid #hierarchicalGrid width="800px" [height]="'550px'" [data]="hierarchicalData" [autoGenerate]="false"
     [allowAdvancedFiltering]="true" [cellMergeMode]="'always'">
     <igx-grid-toolbar></igx-grid-toolbar>
     <igx-column field="EmployeeID" width="200px">
@@ -62,3 +62,14 @@ <h4 class="sample-title">Hierarchical grid with cell merge</h4>
 
     </igx-row-island>
 </igx-hierarchical-grid>
+
+<h4 class="sample-title">Tree grid with cell merge</h4>
+
+<igx-tree-grid [autoGenerate]="false" [data]="treeData" [cellMergeMode]="'always'"
+childDataKey="ChildCompanies" primaryKey="ID" [expansionDepth]="1" width="800px" [height]="'550px'">
+<igx-column field="ContactName" width="200px">
+</igx-column>
+<igx-column field="ContactTitle" width="200px"></igx-column>
+<igx-column field="Country" width="200px" [merge]="true" sortable="true"></igx-column>
+<igx-column field="City" width="200px" [merge]="true" sortable="true"></igx-column>
+</igx-tree-grid>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index e44ce6a7179..19acbca30da 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -15,10 +15,12 @@ import {
     IgxHierarchicalGridComponent,
     IgxPaginatorComponent,
     IgxRowIslandComponent,
+    IgxTreeGridComponent
 } from 'igniteui-angular';
 import { HIERARCHICAL_DATA } from '../shared/hierarchicalData';
 
 import { data, dataWithoutPK } from '../shared/data';
+import { HIERARCHICAL_SAMPLE_DATA } from '../shared/sample-data';
 
 @Component({
     selector: 'app-grid-cellMerging',
@@ -39,11 +41,13 @@ import { data, dataWithoutPK } from '../shared/data';
         IgxGridToolbarHidingComponent,
         IgxGridToolbarExporterComponent,
         IgxHierarchicalGridComponent,
-        IgxRowIslandComponent
+        IgxRowIslandComponent,
+        IgxTreeGridComponent
     ]
 })
 export class GridCellMergingComponent {
     public hierarchicalData = HIERARCHICAL_DATA.concat(HIERARCHICAL_DATA).concat(HIERARCHICAL_DATA);
+    public treeData = HIERARCHICAL_SAMPLE_DATA;
     public data = [{
         ProductID: 1,
         ProductName: 'Chai',

From 7ac17e45e2ef5803cb0ec4cdfe903fceb291ea11 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 16 Jul 2025 14:39:55 +0300
Subject: [PATCH 30/54] chore(*): Export strategies in package.

---
 projects/igniteui-angular-elements/src/public_api.ts     | 3 ++-
 projects/igniteui-angular/src/public_api.ts              | 1 +
 src/app/grid-cellMerging/grid-cellMerging.component.html | 2 +-
 src/app/grid-cellMerging/grid-cellMerging.component.ts   | 2 ++
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular-elements/src/public_api.ts b/projects/igniteui-angular-elements/src/public_api.ts
index d8081637986..aa796e8c5b2 100644
--- a/projects/igniteui-angular-elements/src/public_api.ts
+++ b/projects/igniteui-angular-elements/src/public_api.ts
@@ -12,7 +12,7 @@ import { IgxPivotDateDimension } from 'projects/igniteui-angular/src/lib/grids/p
 import { PivotDimensionType } from 'projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.interface';
 import { IgxDateSummaryOperand, IgxNumberSummaryOperand, IgxSummaryOperand, IgxTimeSummaryOperand } from 'projects/igniteui-angular/src/lib/grids/summaries/grid-summary';
 import { HorizontalAlignment, VerticalAlignment } from 'projects/igniteui-angular/src/lib/services/overlay/utilities';
-
+import { ByLevelTreeGridMergeStrategy } from 'projects/igniteui-angular/src/lib/data-operations/merge-strategy';
 
 /** Export Public API, TODO: reorganize, Generate all w/ renames? */
 export {
@@ -35,6 +35,7 @@ export {
 
     NoopSortingStrategy as IgcNoopSortingStrategy,
     NoopFilteringStrategy as IgcNoopFilteringStrategy,
+    ByLevelTreeGridMergeStrategy as IgcByLevelTreeGridMergeStrategy,
 
     // Pivot API
     IgxPivotDateDimension as IgcPivotDateDimension,
diff --git a/projects/igniteui-angular/src/public_api.ts b/projects/igniteui-angular/src/public_api.ts
index 0e844761ba2..d4a70104a95 100644
--- a/projects/igniteui-angular/src/public_api.ts
+++ b/projects/igniteui-angular/src/public_api.ts
@@ -52,6 +52,7 @@ export * from './lib/data-operations/filtering-expressions-tree';
 export * from './lib/data-operations/filtering-condition';
 export * from './lib/data-operations/filtering-state.interface';
 export * from './lib/data-operations/filtering-strategy';
+export * from './lib/data-operations/merge-strategy';
 export { ExpressionsTreeUtil } from './lib/data-operations/expressions-tree-util';
 export * from './lib/data-operations/groupby-expand-state.interface';
 export * from './lib/data-operations/groupby-record.interface';
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 5dd64944ae1..f9c41c1580e 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -65,7 +65,7 @@ <h4 class="sample-title">Hierarchical grid with cell merge</h4>
 
 <h4 class="sample-title">Tree grid with cell merge</h4>
 
-<igx-tree-grid [autoGenerate]="false" [data]="treeData" [cellMergeMode]="'always'"
+<igx-tree-grid [autoGenerate]="false" [data]="treeData" [cellMergeMode]="'always'" [mergeStrategy]="treeGridMergeStrategy"
 childDataKey="ChildCompanies" primaryKey="ID" [expansionDepth]="1" width="800px" [height]="'550px'">
 <igx-column field="ContactName" width="200px">
 </igx-column>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index 19acbca30da..497e4001350 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -21,6 +21,7 @@ import { HIERARCHICAL_DATA } from '../shared/hierarchicalData';
 
 import { data, dataWithoutPK } from '../shared/data';
 import { HIERARCHICAL_SAMPLE_DATA } from '../shared/sample-data';
+import { ByLevelTreeGridMergeStrategy } from 'igniteui-angular';
 
 @Component({
     selector: 'app-grid-cellMerging',
@@ -48,6 +49,7 @@ import { HIERARCHICAL_SAMPLE_DATA } from '../shared/sample-data';
 export class GridCellMergingComponent {
     public hierarchicalData = HIERARCHICAL_DATA.concat(HIERARCHICAL_DATA).concat(HIERARCHICAL_DATA);
     public treeData = HIERARCHICAL_SAMPLE_DATA;
+    public treeGridMergeStrategy =  new ByLevelTreeGridMergeStrategy();
     public data = [{
         ProductID: 1,
         ProductName: 'Chai',

From 401370e6e9b4c0ba1e70662ff498724efedf3ae4 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 16 Jul 2025 16:39:25 +0300
Subject: [PATCH 31/54] chore(*): Fix chip displaying when in merged cell.

---
 .../src/lib/grids/grid/grid-row.component.html            | 8 ++++----
 .../hierarchical-grid/hierarchical-row.component.html     | 4 ++--
 .../src/lib/grids/pivot-grid/pivot-row.component.html     | 2 +-
 projects/igniteui-angular/src/lib/grids/row.directive.ts  | 4 ++--
 .../src/lib/grids/tree-grid/tree-grid-row.component.html  | 4 ++--
 src/app/grid-cellMerging/grid-cellMerging.component.html  | 1 -
 src/app/grid-cellMerging/grid-cellMerging.component.ts    | 2 ++
 7 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
index b8e27a76e34..e8f2a00cab7 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html
@@ -162,7 +162,7 @@
         [lastSearchInfo]="grid.lastSearchInfo"
         [active]="isCellActive(col.visibleIndex)"
         [cellSelectionMode]="grid.cellSelection"
-        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         #cell>
     </igx-grid-cell>
 </ng-template>
@@ -194,7 +194,7 @@
         [lastSearchInfo]="grid.lastSearchInfo"
         [active]="isCellActive(col.visibleIndex)"
         [cellSelectionMode]="grid.cellSelection"
-        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         #cell>
     </igx-expandable-grid-cell>
 </ng-template>
@@ -226,7 +226,7 @@
         [lastSearchInfo]="grid.lastSearchInfo"
         [active]="isCellActive(col.visibleIndex)"
         [cellSelectionMode]="grid.cellSelection"
-        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         #cell>
     </igx-grid-cell>
 </ng-template>
@@ -258,7 +258,7 @@
         [lastSearchInfo]="grid.lastSearchInfo"
         [active]="isCellActive(col.visibleIndex)"
         [cellSelectionMode]="grid.cellSelection"
-        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         #cell>
     </igx-expandable-grid-cell>
 </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html
index 4c286034977..1f0b9e60507 100644
--- a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-row.component.html
@@ -114,7 +114,7 @@
                 [cellValidationErrorTemplate]="col.errorTemplate"
                 [lastSearchInfo]="grid.lastSearchInfo"
                 [cellSelectionMode]="grid.cellSelection"
-                [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)">
+                [displayPinnedChip]="shouldDisplayPinnedChip(col)">
             </igx-hierarchical-grid-cell>
         }
     </ng-template>
@@ -148,6 +148,6 @@
     [cellValidationErrorTemplate]="col.errorTemplate"
     [lastSearchInfo]="grid.lastSearchInfo"
     [cellSelectionMode]="grid.cellSelection"
-    [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)">
+    [displayPinnedChip]="shouldDisplayPinnedChip(col)">
 </igx-hierarchical-grid-cell>
 </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-row.component.html b/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-row.component.html
index 39d6a48bd63..a6a93da2e92 100644
--- a/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-row.component.html
@@ -16,7 +16,7 @@
         [style.flex-basis]="col.resolvedWidth" [width]="col.getCellWidth()" [visibleColumnIndex]="col.visibleIndex"
         [value]="pivotAggregationData[col.field] | dataMapper:col.field:grid.pipeTrigger:pivotAggregationData[col.field]:col.hasNestedPath"
         [cellTemplate]="col.bodyTemplate" [lastSearchInfo]="grid.lastSearchInfo"
-        [cellSelectionMode]="grid.cellSelection" [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [cellSelectionMode]="grid.cellSelection" [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         (pointerdown)="grid.navigation.focusOutRowHeader($event)">
     </igx-grid-cell>
 </ng-template>
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index f094531c37f..4794d494075 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -578,8 +578,8 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
     /**
      * @hidden
      */
-    public shouldDisplayPinnedChip(visibleColumnIndex: number): boolean {
-        return this.pinned && this.disabled && visibleColumnIndex === 0;
+    public shouldDisplayPinnedChip(col: ColumnType): boolean {
+        return this.pinned && this.disabled && col.visibleIndex === 0 && !this.metaData?.cellMergeMeta?.get(col.field)?.root;
     }
 
     /**
diff --git a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html
index fd1fa6737fb..16ccc6ae995 100644
--- a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html
+++ b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-row.component.html
@@ -105,7 +105,7 @@
         [lastSearchInfo]="grid.lastSearchInfo"
         [active]="isCellActive(col.visibleIndex)"
         [cellSelectionMode]="grid.cellSelection"
-        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         #treeCell>
     </igx-grid-cell>
 </ng-template>
@@ -142,7 +142,7 @@
         [lastSearchInfo]="grid.lastSearchInfo"
         [active]="isCellActive(col.visibleIndex)"
         [cellSelectionMode]="grid.cellSelection"
-        [displayPinnedChip]="shouldDisplayPinnedChip(col.visibleIndex)"
+        [displayPinnedChip]="shouldDisplayPinnedChip(col)"
         #treeCell>
     </igx-tree-grid-cell>
 </ng-template>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index f9c41c1580e..e2054dac1a7 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -59,7 +59,6 @@ <h4 class="sample-title">Hierarchical grid with cell merge</h4>
         </igx-column>
         <igx-column field="ShipCity" width="200px" [merge]="true" sortable="true">
         </igx-column>
-
     </igx-row-island>
 </igx-hierarchical-grid>
 
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index 497e4001350..ec6eed2b1a3 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -50,6 +50,8 @@ export class GridCellMergingComponent {
     public hierarchicalData = HIERARCHICAL_DATA.concat(HIERARCHICAL_DATA).concat(HIERARCHICAL_DATA);
     public treeData = HIERARCHICAL_SAMPLE_DATA;
     public treeGridMergeStrategy =  new ByLevelTreeGridMergeStrategy();
+    public alignBottom = { alignItems: "flex-end", paddingBottom: "12px"};
+    public alignTop= { alignItems: "flex-start", paddingTop: "12px" };
     public data = [{
         ProductID: 1,
         ProductName: 'Chai',

From 5e1b702f619c4b3d9313df1309a3dc920749916d Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 16 Jul 2025 17:16:15 +0300
Subject: [PATCH 32/54] chore(*): Minor tweaks. Console warn on invalid setup.

---
 .../src/lib/data-operations/merge-strategy.ts    |  1 +
 .../src/lib/grids/columns/column.component.ts    | 16 +++++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index 4d20587775e..1c16f7df755 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -14,6 +14,7 @@ export interface IGridMergeStrategy {
         activeRowIndex? : number,
         grid?: GridType
     ) => any[];
+    comparer: (prevRecord: any, record: any, field: string) => boolean;
 }
 
 export class DefaultMergeStrategy implements IGridMergeStrategy {
diff --git a/projects/igniteui-angular/src/lib/grids/columns/column.component.ts b/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
index 58b3de78586..7aa2e7807b7 100644
--- a/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
+++ b/projects/igniteui-angular/src/lib/grids/columns/column.component.ts
@@ -115,7 +115,17 @@ export class IgxColumnComponent implements AfterContentInit, OnDestroy, ColumnTy
      *
      */
     @Input()
-    public merge = false;
+    public get merge() {
+        return this._merge;
+    }
+
+    public set merge(value) {
+        if (this.grid.hasColumnLayouts) {
+            console.warn('Merging is not supported with multi-row layouts.');
+            return;
+        }
+        this._merge = value;
+    }
 
     /**
      * @hidden @internal
@@ -1911,6 +1921,10 @@ export class IgxColumnComponent implements AfterContentInit, OnDestroy, ColumnTy
      * @hidden
      */
     protected _groupable = false;
+    /**
+     * @hidden
+     */
+    protected _merge = false;
     /**
      *  @hidden
      */

From 58e6bfac1c39e6b505efeb13965233bec2b9d140 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 13:39:30 +0300
Subject: [PATCH 33/54] chore(*): Fix lint errors.

---
 .../igniteui-angular/src/lib/grids/grid-base.directive.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 97a625a806e..325f9db900f 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -2505,10 +2505,10 @@ export abstract class IgxGridBaseDirective implements GridType,
      * ```
      */
     @Input()
-    get mergeStrategy() {
+    public get mergeStrategy() {
         return this._mergeStrategy;
     }
-    set  mergeStrategy(value) {
+    public set  mergeStrategy(value) {
         this._mergeStrategy = value;
     }
 
@@ -3974,7 +3974,7 @@ export abstract class IgxGridBaseDirective implements GridType,
     public get columnsToMerge() : ColumnType[] {
         return this.visibleColumns.filter(
             x => x.merge && (this.cellMergeMode ==='always' ||
-            (this.cellMergeMode === 'onSort' && !!this.sortingExpressions.find( x=> x.fieldName === x.fieldName)))
+            (this.cellMergeMode === 'onSort' && !!this.sortingExpressions.find( y => y.fieldName === x.field)))
         );
     }
 
@@ -4058,7 +4058,7 @@ export abstract class IgxGridBaseDirective implements GridType,
         const columnToMerge = this.visibleColumns.filter(
             x => x.merge && (this.cellMergeMode ==='always' ||
             (this.cellMergeMode === 'onSort' && !!this.sortingExpressions
-                .find( x=> x.fieldName === x.fieldName)))
+                .find(y => y.fieldName === x.field)))
         );
         return columnToMerge.length > 0;
     }

From 5e81bf91320d989045f9f13e7f4adb8e8904fa20 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 13:44:02 +0300
Subject: [PATCH 34/54] chore(*): Fix theming lint.

---
 .../src/lib/core/styles/components/grid/_grid-theme.scss        | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
index bf9d1774dd5..605fcda9a59 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
@@ -1830,10 +1830,12 @@
                 %igx-grid__td--merged {
                     color: var-get($theme, 'row-selected-text-color');
                     background: var-get($theme, 'row-selected-background');
+
                     &:hover {
                         background: var-get($theme, 'row-selected-hover-background');
                         color: var-get($theme, 'row-selected-hover-text-color');
                     }
+
                     &%igx-grid__td--merged-hovered {
                         background: var-get($theme, 'row-selected-hover-background');
                         color: var-get($theme, 'row-selected-hover-text-color');

From b2b61a7492cdcb6f072cabef5cd8bd95d425aff8 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 15:02:18 +0300
Subject: [PATCH 35/54] chore(*): Fix build and imports.

---
 .../src/lib/data-operations/data-util.ts            |  7 -------
 .../src/lib/data-operations/merge-strategy.ts       | 13 +++++++++----
 .../src/lib/grids/grid/grid.pipes.ts                |  2 +-
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/data-util.ts b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
index 429321ffbef..bdd51b5d07f 100644
--- a/projects/igniteui-angular/src/lib/data-operations/data-util.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
@@ -38,13 +38,6 @@ import { DefaultMergeStrategy, IGridMergeStrategy } from './merge-strategy';
 } as const;
 export type DataType = (typeof DataType)[keyof typeof DataType];
 
-
-export interface IMergeByResult {
-    rowSpan: number;
-    root?: any;
-    prev?: any;
-}
-
 /**
  * @hidden
  */
diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index 1c16f7df755..6339f0064d9 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -1,9 +1,14 @@
-import { GridCellMergeMode, IMergeByResult } from 'igniteui-angular';
-import type { KeyOfOrString } from '../core/types';
-import { IBaseEventArgs } from '../core/utils';
-import { ColumnType, GridType } from '../grids/common/grid.interface';
+import { GridType } from '../grids/common/grid.interface';
 
 
+
+
+export interface IMergeByResult {
+    rowSpan: number;
+    root?: any;
+    prev?: any;
+}
+
 export interface IGridMergeStrategy {
     /* blazorSuppress */
     merge: (
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index dbfb9d676c1..8cef2a8034e 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -9,7 +9,7 @@ import { ColumnType, GridType, IGX_GRID_BASE } from '../common/grid.interface';
 import { FilterUtil, IFilteringStrategy } from '../../data-operations/filtering-strategy';
 import { ISortingExpression } from '../../data-operations/sorting-strategy';
 import { IGridSortingStrategy, IGridGroupingStrategy } from '../common/strategy';
-import { GridCellMergeMode } from 'igniteui-angular';
+import { GridCellMergeMode } from '../common/enums';
 
 /**
  * @hidden

From 9a7a2d25bfe2ed796ee5b19aa8c8395a4d996c07 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 15:13:16 +0300
Subject: [PATCH 36/54] chore(*): Add null check.

---
 projects/igniteui-angular/src/lib/grids/row.directive.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 4794d494075..0e6c12ef6b7 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -524,7 +524,7 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
 
     public isCellActive(visibleColumnIndex) {
         const node = this.grid.navigation.activeNode;
-        const field = this.grid.visibleColumns[visibleColumnIndex].field;
+        const field = this.grid.visibleColumns[visibleColumnIndex]?.field;
         const rowSpan = this.metaData?.cellMergeMeta?.get(field)?.rowSpan;
         if (rowSpan > 1) {
             return node ? (node.row >= this.index && node.row < this.index + rowSpan)

From ce0c854c386590ac1321c20730cd2eee87821ea8 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 16:53:59 +0300
Subject: [PATCH 37/54] chore(*): Null check for activeRowIndex.

---
 projects/igniteui-angular/src/lib/grids/grid-base.directive.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 325f9db900f..13c24649a0b 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -4051,7 +4051,7 @@ export abstract class IgxGridBaseDirective implements GridType,
 
 
     protected get activeRowIndex() {
-        return this.navigation.activeNode.row;
+        return this.navigation.activeNode?.row;
     }
 
     protected get hasCellsToMerge() {

From a6fc511f5ab346aad330b17267bdb555307f41b8 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 17:07:49 +0300
Subject: [PATCH 38/54] chore(*): Generate elements config.

---
 .../src/analyzer/elements.config.ts                         | 3 +++
 .../igniteui-angular/src/lib/grids/grid-base.directive.ts   | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/projects/igniteui-angular-elements/src/analyzer/elements.config.ts b/projects/igniteui-angular-elements/src/analyzer/elements.config.ts
index be2f3f4d6d5..e78d3492d9d 100644
--- a/projects/igniteui-angular-elements/src/analyzer/elements.config.ts
+++ b/projects/igniteui-angular-elements/src/analyzer/elements.config.ts
@@ -95,6 +95,7 @@ export var registerConfig = [
     ],
     numericProps: ["rowEnd", "colEnd", "rowStart", "colStart"],
     boolProps: [
+      "merge",
       "sortable",
       "selectable",
       "groupable",
@@ -158,6 +159,7 @@ export var registerConfig = [
       "expanded",
       "searchable",
       "hidden",
+      "merge",
       "sortable",
       "groupable",
       "editable",
@@ -213,6 +215,7 @@ export var registerConfig = [
       "collapsible",
       "expanded",
       "searchable",
+      "merge",
       "sortable",
       "groupable",
       "editable",
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 13c24649a0b..8b34b98060e 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3695,7 +3695,7 @@ export abstract class IgxGridBaseDirective implements GridType,
         return rec?.cellMergeMeta;
     }
 
-    public getMergeCellOffset(rowData) {
+    protected getMergeCellOffset(rowData) {
         const index = rowData.index;
         let offset = this.verticalScrollContainer.scrollPosition - this.verticalScrollContainer.getScrollForIndex(index);
         if (this.hasPinnedRecords && this.isRowPinningToTop) {
@@ -3971,6 +3971,10 @@ export abstract class IgxGridBaseDirective implements GridType,
         }
     }
 
+    /**
+     * @hidden
+     * @internal
+     */
     public get columnsToMerge() : ColumnType[] {
         return this.visibleColumns.filter(
             x => x.merge && (this.cellMergeMode ==='always' ||

From d0254734c210cabbedbfe65d02e5e5d5f6ca803c Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 17 Jul 2025 18:03:04 +0300
Subject: [PATCH 39/54] chore(*): Break up merge groups on cell selection.

---
 .../igniteui-angular/src/lib/data-operations/data-util.ts   | 4 ++--
 .../src/lib/data-operations/merge-strategy.ts               | 6 +++---
 .../igniteui-angular/src/lib/grids/grid-base.directive.ts   | 6 ++++--
 .../igniteui-angular/src/lib/grids/grid/grid.component.html | 4 ++--
 projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts  | 4 ++--
 .../hierarchical-grid/hierarchical-grid.component.html      | 4 ++--
 .../src/lib/grids/tree-grid/tree-grid.component.html        | 4 ++--
 src/app/grid-cellMerging/grid-cellMerging.component.html    | 2 +-
 8 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/data-operations/data-util.ts b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
index bdd51b5d07f..0066cd58f4e 100644
--- a/projects/igniteui-angular/src/lib/data-operations/data-util.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/data-util.ts
@@ -91,11 +91,11 @@ export class DataUtil {
         return grouping.groupBy(data, state, grid, groupsRecords, fullResult);
     }
 
-    public static merge<T>(data: T[], columns: ColumnType[], strategy: IGridMergeStrategy = new DefaultMergeStrategy(), activeRowIndex = -1, grid: GridType = null,
+    public static merge<T>(data: T[], columns: ColumnType[], strategy: IGridMergeStrategy = new DefaultMergeStrategy(), activeRowIndexes = [], grid: GridType = null,
     ): any[] {
         let result = [];
         for (const col of columns) {
-            strategy.merge(data, col.field, col.mergingComparer, result, activeRowIndex, grid);
+            strategy.merge(data, col.field, col.mergingComparer, result, activeRowIndexes, grid);
         }
         return result;
 }
diff --git a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
index 6339f0064d9..d1e5b5f9b5a 100644
--- a/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
+++ b/projects/igniteui-angular/src/lib/data-operations/merge-strategy.ts
@@ -16,7 +16,7 @@ export interface IGridMergeStrategy {
         field: string,
         comparer: (prevRecord: any, currentRecord: any, field: string) => boolean,
         result: any[],
-        activeRowIndex? : number,
+        activeRowIndexes : number[],
         grid?: GridType
     ) => any[];
     comparer: (prevRecord: any, record: any, field: string) => boolean;
@@ -35,7 +35,7 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
         field: string,
         comparer: (prevRecord: any, record: any, field: string) => boolean = this.comparer,
         result: any[],
-        activeRowIndex?: number,
+        activeRowIndexes : number[],
         grid?: GridType
     ) {
         let prev = null;
@@ -44,7 +44,7 @@ export class DefaultMergeStrategy implements IGridMergeStrategy {
 
             const recData = result[index];
             // if this is active row or some special record type - add and skip merging
-            if (activeRowIndex === index || (grid && grid.isDetailRecord(rec) || grid.isGroupByRecord(rec) || grid.isChildGridRecord(rec))) {
+            if (activeRowIndexes.indexOf(index) != -1 || (grid && grid.isDetailRecord(rec) || grid.isGroupByRecord(rec) || grid.isChildGridRecord(rec))) {
                 if(!recData) {
                     result.push(rec);
                 }
diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 8b34b98060e..b41b24eb7bb 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -4054,8 +4054,10 @@ export abstract class IgxGridBaseDirective implements GridType,
     }
 
 
-    protected get activeRowIndex() {
-        return this.navigation.activeNode?.row;
+    protected get activeRowIndexes(): number[] {
+        const activeRow = this.navigation.activeNode?.row;
+        const selectedCellIndexes = (this.selectionService.selection?.keys() as any)?.toArray();
+        return [activeRow, ...selectedCellIndexes];
     }
 
     protected get hasCellsToMerge() {
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
index 04915e5f558..4e86643da62 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.component.html
@@ -63,7 +63,7 @@
                 | gridRowPinning:id:true:pipeTrigger
                 | gridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger:true
                 | gridSort:sortingExpressions:groupingExpressions:sortStrategy:id:pipeTrigger:true
-                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger; as pinnedData) {
+                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndexes:pipeTrigger; as pinnedData) {
                 @if (pinnedData.length > 0) {
                     <div #pinContainer
                         [ngClass]="{
@@ -90,7 +90,7 @@
         | gridDetails:hasDetails:expansionStates:pipeTrigger
         | gridAddRow:false:pipeTrigger
         | gridRowPinning:id:false:pipeTrigger
-        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:((hasPinnedRecords && isRowPinningToTop) ? activeRowIndex - pinnedRecordsCount : activeRowIndex):pipeTrigger"
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndexes:pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight"
             [igxForItemSize]="hasColumnLayouts ? rowHeight * multiRowLayoutRowSize + 1 : renderedRowHeight"
diff --git a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
index 8cef2a8034e..ca1299cf479 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/grid.pipes.ts
@@ -85,12 +85,12 @@ export class IgxGridCellMergePipe implements PipeTransform {
 
     constructor(@Inject(IGX_GRID_BASE) private grid: GridType) { }
 
-    public transform(collection: any, visibleColumns: ColumnType[], mergeMode: GridCellMergeMode, sortExpr: ISortingExpression[], activeRowIndex: number, _pipeTrigger: number) {
+    public transform(collection: any, visibleColumns: ColumnType[], mergeMode: GridCellMergeMode, sortExpr: ISortingExpression[], activeRowIndexes: number[], _pipeTrigger: number) {
         const colsToMerge = this.grid.columnsToMerge;
         if (colsToMerge.length=== 0) {
             return collection;
         }
-        const result = DataUtil.merge(cloneArray(collection), colsToMerge, this.grid.mergeStrategy, activeRowIndex, this.grid);
+        const result = DataUtil.merge(cloneArray(collection), colsToMerge, this.grid.mergeStrategy, activeRowIndexes, this.grid);
         return result;
     }
 }
diff --git a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
index 83f795de93d..26e9b5efd5c 100644
--- a/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.html
@@ -46,7 +46,7 @@
                 | gridRowPinning:id:true:pipeTrigger
                 | gridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger:true
                 | gridSort:sortingExpressions:[]:sortStrategy:id:pipeTrigger:true
-                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger; as pinnedData
+                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndexes:pipeTrigger; as pinnedData
             ) {
                 @if (pinnedData.length > 0) {
                     <div #pinContainer class="igx-grid__tr--pinned"
@@ -71,7 +71,7 @@
         | gridHierarchical:expansionStates:id:primaryKey:childLayoutKeys:pipeTrigger
         | gridAddRow:false:pipeTrigger
         | gridRowPinning:id:false:pipeTrigger
-        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:((hasPinnedRecords && isRowPinningToTop) ? activeRowIndex - pinnedRecordsCount : activeRowIndex):pipeTrigger"
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndexes:pipeTrigger"
             [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]="verticalScroll"
             [igxForContainerSize]="calcHeight" [igxForItemSize]="renderedRowHeight" [igxForTrackBy]="trackChanges"
             #verticalScrollContainer (chunkPreload)="dataLoading($event)" (dataChanging)="dataRebinding($event)" (dataChanged)="dataRebound($event)">
diff --git a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
index 3560107c5ce..9e16f82611d 100644
--- a/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
+++ b/projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid.component.html
@@ -47,7 +47,7 @@
                 | gridRowPinning:id:true:pipeTrigger
                 | treeGridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:pipeTrigger:filteringPipeTrigger:true
                 | treeGridSorting:sortingExpressions:treeGroupArea?.expressions:sortStrategy:pipeTrigger:true
-                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndex:pipeTrigger; as pinnedData
+                | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndexes:pipeTrigger; as pinnedData
             ) {
                 @if (pinnedData.length > 0) {
                     <div #pinContainer
@@ -76,7 +76,7 @@
         | treeGridSummary:hasSummarizedColumns:summaryCalculationMode:summaryPosition:showSummaryOnCollapse:pipeTrigger:summaryPipeTrigger
         | treeGridAddRow:false:pipeTrigger
         | gridRowPinning:id:false:pipeTrigger
-        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:((hasPinnedRecords && isRowPinningToTop) ? activeRowIndex - pinnedRecordsCount : activeRowIndex):pipeTrigger"
+        | gridCellMerge:visibleColumns:cellMergeMode:sortingExpressions:activeRowIndexes:pipeTrigger"
             let-rowIndex="index" [igxForScrollOrientation]="'vertical'" [igxForScrollContainer]='verticalScroll'
             [igxForContainerSize]='calcHeight' [igxForItemSize]="renderedRowHeight" #verticalScrollContainer
             (dataChanging)="dataRebinding($event)" (dataChanged)="dataRebound($event)">
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index e2054dac1a7..15a44d78af3 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,5 +1,5 @@
 <h4 class="sample-title">Grid with cell merge</h4>
-<igx-grid [data]="data" width="800px" height="550px" [primaryKey]="'ProductID'" [moving]="true"
+<igx-grid [data]="data" width="800px" height="550px" [moving]="true"
     [cellMergeMode]="'always'" [rowSelection]="'single'">
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>

From 190f29d52afa0635f30619ad87a17f9caad249da Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 18 Jul 2025 11:58:07 +0300
Subject: [PATCH 40/54] chore(*): Update active indexes on events. Cache result
 to limit pipe trigger.

---
 .../src/lib/grids/grid-base.directive.ts      | 20 ++++++++++++++++---
 .../lib/grids/selection/selection.service.ts  |  9 ++++++++-
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index b41b24eb7bb..43cd98538a7 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3246,6 +3246,7 @@ export abstract class IgxGridBaseDirective implements GridType,
     private _filteredSortedData = null;
     private _filteredData = null;
     private _mergedDataInView = null;
+    private _activeRowIndexes = null;
 
     private _customDragIndicatorIconTemplate: TemplateRef<IgxGridEmptyTemplateContext>;
     private _excelStyleHeaderIconTemplate: TemplateRef<IgxGridHeaderTemplateContext>;
@@ -3907,6 +3908,14 @@ export abstract class IgxGridBaseDirective implements GridType,
                 this.autoSizeColumnsInView();
                 this._firstAutoResize = false;
             });
+
+        this.activeNodeChange.pipe(filter(() => !this._init), destructor).subscribe(() => {
+            this._activeRowIndexes = null;
+        });
+
+        this.selectionService.selectedRangeChange.pipe(filter(() => !this._init), destructor).subscribe(() => {
+            this._activeRowIndexes = null;
+        });
     }
 
     /**
@@ -4055,9 +4064,14 @@ export abstract class IgxGridBaseDirective implements GridType,
 
 
     protected get activeRowIndexes(): number[] {
-        const activeRow = this.navigation.activeNode?.row;
-        const selectedCellIndexes = (this.selectionService.selection?.keys() as any)?.toArray();
-        return [activeRow, ...selectedCellIndexes];
+        if (this._activeRowIndexes) {
+            return this._activeRowIndexes;
+        } else {
+            const activeRow = this.navigation.activeNode?.row;
+            const selectedCellIndexes = (this.selectionService.selection?.keys() as any)?.toArray();
+            this._activeRowIndexes = [activeRow, ...selectedCellIndexes];
+            return this._activeRowIndexes;
+        }
     }
 
     protected get hasCellsToMerge() {
diff --git a/projects/igniteui-angular/src/lib/grids/selection/selection.service.ts b/projects/igniteui-angular/src/lib/grids/selection/selection.service.ts
index 83287824d16..0a92780d866 100644
--- a/projects/igniteui-angular/src/lib/grids/selection/selection.service.ts
+++ b/projects/igniteui-angular/src/lib/grids/selection/selection.service.ts
@@ -35,6 +35,11 @@ export class IgxGridSelectionService {
      */
     public selectedRowsChange = new Subject<any[]>();
 
+    /**
+     * @hidden @internal
+     */
+    public selectedRangeChange = new Subject<Map<number, Set<number>>>();
+
     /**
      * Toggled when a pointerdown event is triggered inside the grid body (cells).
      * When `false` the drag select behavior is disabled.
@@ -355,6 +360,8 @@ export class IgxGridSelectionService {
                 }
             }
         }
+
+        this.selectedRangeChange.next(collection);
     }
 
     public dragSelect(node: ISelectionNode, state: SelectionState): void {
@@ -637,7 +644,7 @@ export class IgxGridSelectionService {
         if (this.areEqualCollections(currSelection, newSelection)) {
             return;
         }
-        
+
         const args: IRowSelectionEventArgs = {
             owner: this.grid,
             oldSelection: currSelection,

From 50e7d85a7dae9575aa97636f939da85580b4dc2f Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 18 Jul 2025 17:14:00 +0300
Subject: [PATCH 41/54] chore(*): When searching, mark merged cells as a single
 result.

---
 .../src/lib/grids/grid-base.directive.ts      | 28 ++++++-----
 .../grid-cellMerging.component.html           | 46 ++++++++++++++++++-
 .../grid-cellMerging.component.ts             | 28 ++++++++++-
 3 files changed, 89 insertions(+), 13 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 43cd98538a7..c563367f506 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -38,7 +38,7 @@ import { IgcTrialWatermark } from 'igniteui-trial-watermark';
 import { Subject, pipe, fromEvent, animationFrameScheduler, merge } from 'rxjs';
 import { takeUntil, first, filter, throttleTime, map, shareReplay, takeWhile } from 'rxjs/operators';
 import { cloneArray, mergeObjects, compareMaps, resolveNestedPath, isObject, PlatformUtil } from '../core/utils';
-import { GridColumnDataType } from '../data-operations/data-util';
+import { DataUtil, GridColumnDataType } from '../data-operations/data-util';
 import { FilteringLogic } from '../data-operations/filtering-expression.interface';
 import { IGroupByRecord } from '../data-operations/groupby-record.interface';
 import { IForOfDataChangeEventArgs, IgxGridForOfDirective } from '../directives/for-of/for_of.directive';
@@ -3911,10 +3911,12 @@ export abstract class IgxGridBaseDirective implements GridType,
 
         this.activeNodeChange.pipe(filter(() => !this._init), destructor).subscribe(() => {
             this._activeRowIndexes = null;
+            this.refreshSearch();
         });
 
         this.selectionService.selectedRangeChange.pipe(filter(() => !this._init), destructor).subscribe(() => {
             this._activeRowIndexes = null;
+            this.refreshSearch();
         });
     }
 
@@ -7977,25 +7979,29 @@ export abstract class IgxGridBaseDirective implements GridType,
         const caseSensitive = this._lastSearchInfo.caseSensitive;
         const exactMatch = this._lastSearchInfo.exactMatch;
         const searchText = caseSensitive ? this._lastSearchInfo.searchText : this._lastSearchInfo.searchText.toLowerCase();
-        const data = this.filteredSortedData;
+        let data = this.filteredSortedData;
+        if (this.hasCellsToMerge) {
+            data =  DataUtil.merge(cloneArray(this.filteredSortedData), this.columnsToMerge, this.mergeStrategy, this.activeRowIndexes, this);
+        }
         const columnItems = this.visibleColumns.filter((c) => !c.columnGroup).sort((c1, c2) => c1.visibleIndex - c2.visibleIndex);
         const columnsPathParts = columnItems.map(col => columnFieldPath(col.field));
 
         data.forEach((dataRow, rowIndex) => {
+            const currentRowData = this.isRecordMerged(dataRow) ? dataRow.recordRef : dataRow;
             columnItems.forEach((c, cid) => {
                 const pipeArgs = this.getColumnByName(c.field).pipeArgs;
-                const value = c.formatter ? c.formatter(resolveNestedPath(dataRow, columnsPathParts[cid]), dataRow) :
-                    c.dataType === 'number' ? formatNumber(resolveNestedPath(dataRow, columnsPathParts[cid]) as number, this.locale, pipeArgs.digitsInfo) :
+                const value = c.formatter ? c.formatter(resolveNestedPath(currentRowData, columnsPathParts[cid]), currentRowData) :
+                    c.dataType === 'number' ? formatNumber(resolveNestedPath(currentRowData, columnsPathParts[cid]) as number, this.locale, pipeArgs.digitsInfo) :
                         c.dataType === 'date'
-                            ? formatDate(resolveNestedPath(dataRow, columnsPathParts[cid]) as string, pipeArgs.format, this.locale, pipeArgs.timezone)
-                            : resolveNestedPath(dataRow, columnsPathParts[cid]);
+                            ? formatDate(resolveNestedPath(currentRowData, columnsPathParts[cid]) as string, pipeArgs.format, this.locale, pipeArgs.timezone)
+                            : resolveNestedPath(currentRowData, columnsPathParts[cid]);
                 if (value !== undefined && value !== null && c.searchable) {
                     let searchValue = caseSensitive ? String(value) : String(value).toLowerCase();
-
+                    const isMergePlaceHolder =  this.isRecordMerged(dataRow) ? !!dataRow?.cellMergeMeta.get(c.field)?.root : false;
                     if (exactMatch) {
-                        if (searchValue === searchText) {
+                        if (searchValue === searchText && !isMergePlaceHolder) {
                             const mic: IMatchInfoCache = {
-                                row: dataRow,
+                                row: currentRowData,
                                 column: c.field,
                                 index: 0,
                                 metadata: new Map<string, boolean>([['pinned', this.isRecordPinnedByIndex(rowIndex)]])
@@ -8007,9 +8013,9 @@ export abstract class IgxGridBaseDirective implements GridType,
                         let occurrenceIndex = 0;
                         let searchIndex = searchValue.indexOf(searchText);
 
-                        while (searchIndex !== -1) {
+                        while (searchIndex !== -1 && !isMergePlaceHolder) {
                             const mic: IMatchInfoCache = {
-                                row: dataRow,
+                                row: currentRowData,
                                 column: c.field,
                                 index: occurrenceIndex++,
                                 metadata: new Map<string, boolean>([['pinned', this.isRecordPinnedByIndex(rowIndex)]])
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index 15a44d78af3..b522b1af332 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,5 +1,49 @@
 <h4 class="sample-title">Grid with cell merge</h4>
-<igx-grid [data]="data" width="800px" height="550px" [moving]="true"
+
+<div class="grid__wrapper">
+  <igx-input-group type="search" class="offset">
+    <igx-prefix>
+      @if (searchText.length === 0) {
+        <igx-icon>search</igx-icon>
+      }
+      @if (searchText.length > 0) {
+        <igx-icon (click)="clearSearch()">clear</igx-icon>
+      }
+    </igx-prefix>
+
+    <input #search1 id="search1" igxInput placeholder="Search" [(ngModel)]="searchText" (ngModelChange)="grid.findNext(searchText, false, false)"
+      (keydown)="searchKeyDown($event)" />
+
+      @if (searchText.length > 0) {
+        <igx-suffix>
+          @if (grid.lastSearchInfo) {
+            <div class="resultsText">
+              @if (grid.lastSearchInfo.matchInfoCache.length > 0) {
+                <span>
+                  {{ grid.lastSearchInfo.activeMatchIndex + 1 }} of {{ grid.lastSearchInfo.matchInfoCache.length }}
+                  results
+                </span>
+              }
+              @if (grid.lastSearchInfo.matchInfoCache.length === 0) {
+                <span>
+                  No results
+                </span>
+              }
+            </div>
+          }
+          <div class="searchButtons">
+            <button igxIconButton="flat" igxRipple (click)="grid.findPrev(searchText, false, false)">
+              <igx-icon family="material">navigate_before</igx-icon>
+            </button>
+            <button igxIconButton="flat" igxRipple (click)="grid.findNext(searchText, false, false)">
+              <igx-icon family="material">navigate_next</igx-icon>
+            </button>
+          </div>
+        </igx-suffix>
+      }
+    </igx-input-group>
+</div>
+<igx-grid [data]="data" width="800px" height="550px" [moving]="true" #grid1
     [cellMergeMode]="'always'" [rowSelection]="'single'">
     <igx-column field="ProductID" header="Product ID" width="200px">
         <ng-template igxCell let-cell="cell" let-val>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index ec6eed2b1a3..89b86f37a5e 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -13,8 +13,13 @@ import {
     IgxGridToolbarHidingComponent,
     IgxGridToolbarPinningComponent,
     IgxHierarchicalGridComponent,
+    IgxIconComponent,
+    IgxInputDirective,
+    IgxInputGroupComponent,
     IgxPaginatorComponent,
+    IgxPrefixDirective,
     IgxRowIslandComponent,
+    IgxSuffixDirective,
     IgxTreeGridComponent
 } from 'igniteui-angular';
 import { HIERARCHICAL_DATA } from '../shared/hierarchicalData';
@@ -43,7 +48,12 @@ import { ByLevelTreeGridMergeStrategy } from 'igniteui-angular';
         IgxGridToolbarExporterComponent,
         IgxHierarchicalGridComponent,
         IgxRowIslandComponent,
-        IgxTreeGridComponent
+        IgxTreeGridComponent,
+        IgxInputGroupComponent,
+        IgxPrefixDirective,
+        IgxSuffixDirective,
+        IgxIconComponent,
+        IgxInputDirective
     ]
 })
 export class GridCellMergingComponent {
@@ -52,6 +62,8 @@ export class GridCellMergingComponent {
     public treeGridMergeStrategy =  new ByLevelTreeGridMergeStrategy();
     public alignBottom = { alignItems: "flex-end", paddingBottom: "12px"};
     public alignTop= { alignItems: "flex-start", paddingTop: "12px" };
+    public searchText: string ='';
+    @ViewChild('grid1', { static: true }) public grid: IgxGridComponent;
     public data = [{
         ProductID: 1,
         ProductName: 'Chai',
@@ -387,5 +399,19 @@ export class GridCellMergingComponent {
         OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
     }];
 
+    public searchKeyDown(ev) {
+        if (ev.key === 'Enter' || ev.key === 'ArrowDown' || ev.key === 'ArrowRight') {
+            ev.preventDefault();
+            this.grid.findNext(this.searchText, true, false);
+        } else if (ev.key === 'ArrowUp' || ev.key === 'ArrowLeft') {
+            ev.preventDefault();
+            this.grid.findPrev(this.searchText, true, false);
+        }
+    }
+
+    public clearSearch() {
+        this.searchText = '';
+        this.grid.clearSearch();
+    }
 }
 

From 1e560e8aca89e839fa8e87728949903fe488bc5c Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 18 Jul 2025 17:33:47 +0300
Subject: [PATCH 42/54] chore(*): Refresh search if needed only.

---
 .../igniteui-angular/src/lib/grids/grid-base.directive.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index c563367f506..8b3889b317c 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3911,12 +3911,16 @@ export abstract class IgxGridBaseDirective implements GridType,
 
         this.activeNodeChange.pipe(filter(() => !this._init), destructor).subscribe(() => {
             this._activeRowIndexes = null;
-            this.refreshSearch();
+            if (this.hasCellsToMerge) {
+                this.refreshSearch();
+            }
         });
 
         this.selectionService.selectedRangeChange.pipe(filter(() => !this._init), destructor).subscribe(() => {
             this._activeRowIndexes = null;
-            this.refreshSearch();
+            if (this.hasCellsToMerge) {
+                this.refreshSearch();
+            }
         });
     }
 

From 7db787aaa2477999633e98516bc164870f0507a1 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 21 Jul 2025 13:53:19 +0300
Subject: [PATCH 43/54] chore(*): Fix scrollTo when scrolling to a merged cell
 that has larger rowspan.

---
 .../src/lib/grids/grid-base.directive.ts             | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 8b3889b317c..e5bcaa27c3e 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -7633,15 +7633,21 @@ export abstract class IgxGridBaseDirective implements GridType,
                 this.page = page;
             }
         }
-
+        let targetRowIndex = (typeof (row) === 'number' ? row : this.unpinnedDataView.indexOf(row));
+        const virtRec = this.verticalScrollContainer.igxForOf[targetRowIndex];
+        const col = typeof (column) === 'number' ? this.visibleColumns[column] : column;
+        const rowSpan = this.isRecordMerged(virtRec) ? virtRec?.cellMergeMeta.get(col)?.rowSpan : 1;
+       if (rowSpan > 1) {
+            targetRowIndex += Math.floor(rowSpan/2);
+       }
         if (delayScrolling) {
             this.verticalScrollContainer.dataChanged.pipe(first(), takeUntil(this.destroy$)).subscribe(() => {
                 this.scrollDirective(this.verticalScrollContainer,
-                    typeof (row) === 'number' ? row : this.unpinnedDataView.indexOf(row));
+                    targetRowIndex);
             });
         } else {
             this.scrollDirective(this.verticalScrollContainer,
-                typeof (row) === 'number' ? row : this.unpinnedDataView.indexOf(row));
+                targetRowIndex);
         }
 
         this.scrollToHorizontally(column);

From 86bc021d837cc0f1fe5ee20a0f1ef512ae5a73c0 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 21 Jul 2025 16:54:29 +0300
Subject: [PATCH 44/54] chore(*): Add basic merging tests.

---
 .../src/lib/grids/grid/cell-merge.spec.ts     | 227 ++++++++++++++++++
 .../src/lib/test-utils/grid-functions.spec.ts |  17 +-
 2 files changed, 243 insertions(+), 1 deletion(-)
 create mode 100644 projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts

diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
new file mode 100644
index 00000000000..f5f62896f78
--- /dev/null
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -0,0 +1,227 @@
+import { Component, ViewChild } from '@angular/core';
+import { TestBed, waitForAsync } from '@angular/core/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+import { DefaultMergeStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, SortingDirection } from 'igniteui-angular';
+import { DataParent } from '../../test-utils/sample-test-data.spec';
+import { GridFunctions } from '../../test-utils/grid-functions.spec';
+
+describe('IgxGrid - Cell merging #grid', () => {
+    let fix;
+    let grid: IgxGridComponent;
+    beforeEach(waitForAsync(() => {
+        TestBed.configureTestingModule({
+            imports: [
+                NoopAnimationsModule, DefaultCellMergeGridComponent
+            ]
+        }).compileComponents();
+    }));
+
+    beforeEach(() => {
+        fix = TestBed.createComponent(DefaultCellMergeGridComponent);
+        fix.detectChanges();
+        grid = fix.componentInstance.grid;
+    });
+
+    describe('Basic', () => {
+        it('should allow enabling/disabling merging per column.', () => {
+
+            const col = grid.getColumnByName('ProductName');
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: 'Ignite UI for JavaScript', span: 2 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 2 },
+                { value: null , span: 1 },
+                { value: 'NetAdvantage' , span: 2 }
+            ]);
+
+            // disable merge
+            col.merge = false;
+            fix.detectChanges();
+
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: null , span: 1 },
+                { value: 'NetAdvantage' , span: 1 },
+                { value: 'NetAdvantage' , span: 1 }
+            ]);
+        });
+
+        it('should always merge columns if mergeMode is always.', () => {
+            const col = grid.getColumnByName('Released');
+            col.merge = true;
+            fix.detectChanges();
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: true, span: 9 }
+            ]);
+        });
+
+        it('should merge only sorted columns if mergeMode is onSort.', () => {
+            grid.cellMergeMode = 'onSort';
+            fix.detectChanges();
+            const col = grid.getColumnByName('ProductName');
+            //nothing is merged initially
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: null , span: 1 },
+                { value: 'NetAdvantage' , span: 1 },
+                { value: 'NetAdvantage' , span: 1 }
+            ]);
+
+            grid.sort({ fieldName: 'ProductName', dir: SortingDirection.Desc, ignoreCase: false });
+            fix.detectChanges();
+
+            // merge only after sorted
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: 'NetAdvantage' , span: 2 },
+                { value: 'Ignite UI for JavaScript', span: 3 },
+                { value: 'Ignite UI for Angular', span: 3 },
+                { value: null , span: 1 }
+            ]);
+        });
+
+        it('should allow setting a custom merge strategy via mergeStrategy on grid.', () => {
+            grid.mergeStrategy = new NoopMergeStrategy();
+            fix.detectChanges();
+            const col = grid.getColumnByName('ProductName');
+            // this strategy does no merging
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for JavaScript', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: 'Ignite UI for Angular', span: 1 },
+                { value: null , span: 1 },
+                { value: 'NetAdvantage' , span: 1 },
+                { value: 'NetAdvantage' , span: 1 }
+            ]);
+        });
+
+        it('should allow setting a custom comparer for merging on particular column via mergingComparer.', () => {
+            const col = grid.getColumnByName('ProductName');
+            // all are same and should merge
+            col.mergingComparer = (prev:any, rec: any, field: string) => {
+                return true;
+            };
+            grid.pipeTrigger += 1;
+            fix.detectChanges();
+            GridFunctions.verifyColumnMergedState(grid, col, [
+                { value: 'Ignite UI for JavaScript', span: 9 }
+            ]);
+        });
+    });
+});
+
+@Component({
+    template: `
+        <igx-grid [data]="data" [cellMergeMode]="mergeMode" #grid>
+        @for(col of cols; track col) {
+            <igx-column width="100px" [field]="col.field" [dataType]="col.dataType" [merge]="col.merge"></igx-column>
+        }
+        </igx-grid>
+    `,
+    imports: [IgxGridComponent, IgxColumnComponent]
+})
+export class DefaultCellMergeGridComponent extends DataParent {
+    public mergeMode: GridCellMergeMode = GridCellMergeMode.always;
+    @ViewChild('grid', { read: IgxGridComponent, static: true })
+    public grid: IgxGridComponent;
+    public cols = [
+        { field:'ID', merge: false },
+        { field:'ProductName', dataType: GridColumnDataType.String, merge: true },
+        { field:'Downloads', dataType: GridColumnDataType.Number, merge: false },
+        { field:'Released', dataType: GridColumnDataType.Boolean, merge: false },
+        { field:'ReleaseDate', dataType: GridColumnDataType.Date, merge: false }
+    ];
+
+    public override data = [
+        {
+            Downloads: 254,
+            ID: 1,
+            ProductName: 'Ignite UI for JavaScript',
+            ReleaseDate: this.today,
+            Released: true
+        },
+        {
+            Downloads: 1000,
+            ID: 2,
+            ProductName: 'Ignite UI for JavaScript',
+            ReleaseDate: this.nextDay,
+            Released: true
+        },
+        {
+            Downloads: 20,
+            ID: 3,
+            ProductName: 'Ignite UI for Angular',
+            ReleaseDate: null,
+            Released: true
+        },
+        {
+            Downloads: null,
+            ID: 4,
+            ProductName: 'Ignite UI for JavaScript',
+            ReleaseDate: this.prevDay,
+            Released: true
+        },
+        {
+            Downloads: 100,
+            ID: 5,
+            ProductName: 'Ignite UI for Angular',
+            ReleaseDate: null,
+            Released: true
+        },
+        {
+            Downloads: 1000,
+            ID: 6,
+            ProductName: 'Ignite UI for Angular',
+            ReleaseDate: this.nextDay,
+            Released: true
+        },
+        {
+            Downloads: 0,
+            ID: 7,
+            ProductName: null,
+            ReleaseDate: this.prevDay,
+            Released: true
+        },
+        {
+            Downloads: 1000,
+            ID: 8,
+            ProductName: 'NetAdvantage',
+            ReleaseDate: this.today,
+            Released: true
+        },
+        {
+            Downloads: 1000,
+            ID: 9,
+            ProductName: 'NetAdvantage',
+            ReleaseDate: this.prevDay,
+            Released: true
+        }
+    ];
+
+}
+
+class NoopMergeStrategy extends DefaultMergeStrategy {
+    public override merge(
+        data: any[],
+        field: string,
+        comparer: (prevRecord: any, record: any, field: string) => boolean = this.comparer,
+        result: any[],
+        activeRowIndexes : number[],
+        grid?: GridType
+    ) {
+        return data;
+    }
+}
diff --git a/projects/igniteui-angular/src/lib/test-utils/grid-functions.spec.ts b/projects/igniteui-angular/src/lib/test-utils/grid-functions.spec.ts
index e6689a977de..53058f1328a 100644
--- a/projects/igniteui-angular/src/lib/test-utils/grid-functions.spec.ts
+++ b/projects/igniteui-angular/src/lib/test-utils/grid-functions.spec.ts
@@ -19,7 +19,7 @@ import { IgxGridCellComponent } from '../grids/cell.component';
 import { IgxPivotRowComponent } from '../grids/pivot-grid/pivot-row.component';
 import { SortingDirection } from '../data-operations/sorting-strategy';
 import { IgxRowDirective } from '../grids/row.directive';
-import { CellType, GridType, RowType } from '../grids/common/grid.interface';
+import { CellType, ColumnType, GridType, RowType } from '../grids/common/grid.interface';
 import { IgxTreeNodeComponent } from '../tree/tree-node/tree-node.component';
 import { IgxColumnComponent } from '../grids/columns/column.component';
 import { IgxPivotGridComponent } from '../grids/pivot-grid/pivot-grid.component';
@@ -104,6 +104,21 @@ export const SAFE_DISPOSE_COMP_ID = 'root';
 
 export class GridFunctions {
 
+    public static verifyColumnMergedState(grid: GridType, col: ColumnType, state: any[]) {
+        const dataRows = grid.dataRowList.toArray();
+        let totalSpan = 0;
+        for (let index = 0; index < dataRows.length - 1; index++) {
+            const row = dataRows[index];
+            const cellValue = row.cells.toArray().find(x => x.column === col).value;
+            const rowSpan = row.metaData?.cellMergeMeta.get(col.field)?.rowSpan || 1;
+            const currState = state[index - totalSpan];
+            expect(cellValue).toBe(currState.value);
+            expect(rowSpan).toBe(currState.span);
+            totalSpan += (rowSpan - 1);
+            index += (rowSpan - 1);
+        }
+    }
+
     public static getRows(fix): DebugElement[] {
         const rows: DebugElement[] = fix.debugElement.queryAll(By.css(ROW_CSS_CLASS));
         rows.shift();

From 91c457b27f9e261cf15d8aa1cb69fc65cb51764a Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Mon, 21 Jul 2025 18:26:49 +0300
Subject: [PATCH 45/54] chore(*): Add some UI tests for merging.

---
 .../src/lib/grids/grid/cell-merge.spec.ts     | 49 ++++++++++++++++++-
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
index f5f62896f78..b52e0c929e6 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -1,13 +1,19 @@
-import { Component, ViewChild } from '@angular/core';
-import { TestBed, waitForAsync } from '@angular/core/testing';
+import { Component, TemplateRef, ViewChild } from '@angular/core';
+import { fakeAsync, TestBed, tick, waitForAsync } from '@angular/core/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
 import { DefaultMergeStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, SortingDirection } from 'igniteui-angular';
 import { DataParent } from '../../test-utils/sample-test-data.spec';
 import { GridFunctions } from '../../test-utils/grid-functions.spec';
+import { By } from '@angular/platform-browser';
+import { UIInteractions, wait } from '../../test-utils/ui-interactions.spec';
+import { hasClass } from '../../test-utils/helper-utils.spec';
 
 describe('IgxGrid - Cell merging #grid', () => {
     let fix;
     let grid: IgxGridComponent;
+    const MERGE_CELL_CSS_CLASS = '.igx-grid__td--merged';
+    const CELL_CSS_CLASS = '.igx-grid__td';
+    const CSS_CLASS_GRID_ROW = '.igx-grid__tr';
     beforeEach(waitForAsync(() => {
         TestBed.configureTestingModule({
             imports: [
@@ -121,6 +127,38 @@ describe('IgxGrid - Cell merging #grid', () => {
             ]);
         });
     });
+
+
+    describe('UI', () => {
+        it ('should properly align merged cells with their spanned rows.', () => {
+            const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
+            const endRow = fix.debugElement.queryAll(By.css(CSS_CLASS_GRID_ROW))[2].nativeNode;
+            expect(mergedCell.getBoundingClientRect().bottom).toBe(endRow.getBoundingClientRect().bottom);
+        });
+
+        it('should mark merged cell as hovered when hovering any row that intersects that cell.', () => {
+            const secondRow = fix.debugElement.queryAll(By.css(CSS_CLASS_GRID_ROW))[2];
+            UIInteractions.hoverElement(secondRow.nativeNode);
+            fix.detectChanges();
+            // hover 2nd row that intersects the merged cell in row 1
+            const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
+            // merged cell should be marked as hovered
+            hasClass(mergedCell, 'igx-grid__td--merged-hovered', true);
+        });
+
+        it('should set correct size to merged cell that spans multiple rows that have different sizes.', () => {
+            const col = grid.getColumnByName('ID');
+            col.bodyTemplate = fix.componentInstance.customTemplate;
+            fix.detectChanges();
+            grid.verticalScrollContainer.recalcUpdateSizes();
+            grid.dataRowList.toArray().forEach(x => x.cdr.detectChanges());
+            const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
+            // one row is 100px, other is 200, 4px border
+            expect(mergedCell.getBoundingClientRect().height).toBe(100 + 200 + 4);
+
+
+        });
+    });
 });
 
 @Component({
@@ -130,6 +168,9 @@ describe('IgxGrid - Cell merging #grid', () => {
             <igx-column width="100px" [field]="col.field" [dataType]="col.dataType" [merge]="col.merge"></igx-column>
         }
         </igx-grid>
+        <ng-template #customTemplate let-value let-cell="cell">
+            <button [style.height.px]="cell.row.index % 2 === 0 ? 100 : 200" type="button">{{value}}</button>
+        </ng-template>
     `,
     imports: [IgxGridComponent, IgxColumnComponent]
 })
@@ -137,6 +178,10 @@ export class DefaultCellMergeGridComponent extends DataParent {
     public mergeMode: GridCellMergeMode = GridCellMergeMode.always;
     @ViewChild('grid', { read: IgxGridComponent, static: true })
     public grid: IgxGridComponent;
+
+    @ViewChild('customTemplate', { read: TemplateRef, static: true })
+    public customTemplate: TemplateRef<any>;
+
     public cols = [
         { field:'ID', merge: false },
         { field:'ProductName', dataType: GridColumnDataType.String, merge: true },

From a5c5566911789aa96ae481dea7fa2c3951d99529 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Tue, 22 Jul 2025 17:40:07 +0300
Subject: [PATCH 46/54] chore(*): Add some integration tests.

---
 .../src/lib/grids/grid-base.directive.ts      |   2 +-
 .../src/lib/grids/grid/cell-merge.spec.ts     | 460 +++++++++++++-----
 2 files changed, 341 insertions(+), 121 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index e5bcaa27c3e..e47d720920b 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -3891,7 +3891,7 @@ export abstract class IgxGridBaseDirective implements GridType,
                     const rec = prevDataView[index];
                     if (rec.cellMergeMeta &&
                         // index + maxRowSpan is within view
-                        startIndex <= (index + Math.max(...rec.cellMergeMeta.values().toArray().map(x => x.rowSpan)))) {
+                        startIndex < (index + Math.max(...rec.cellMergeMeta.values().toArray().map(x => x.rowSpan)))) {
                             data.push({record: rec, index: index });
                         }
                 }
diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
index b52e0c929e6..87710439b54 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -1,7 +1,7 @@
 import { Component, TemplateRef, ViewChild } from '@angular/core';
 import { fakeAsync, TestBed, tick, waitForAsync } from '@angular/core/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
-import { DefaultMergeStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, SortingDirection } from 'igniteui-angular';
+import { DefaultMergeStrategy, DefaultSortingStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, IgxPaginatorComponent, SortingDirection } from 'igniteui-angular';
 import { DataParent } from '../../test-utils/sample-test-data.spec';
 import { GridFunctions } from '../../test-utils/grid-functions.spec';
 import { By } from '@angular/platform-browser';
@@ -22,142 +22,337 @@ describe('IgxGrid - Cell merging #grid', () => {
         }).compileComponents();
     }));
 
-    beforeEach(() => {
-        fix = TestBed.createComponent(DefaultCellMergeGridComponent);
-        fix.detectChanges();
-        grid = fix.componentInstance.grid;
-    });
+
 
     describe('Basic', () => {
-        it('should allow enabling/disabling merging per column.', () => {
-
-            const col = grid.getColumnByName('ProductName');
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: 'Ignite UI for JavaScript', span: 2 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 2 },
-                { value: null , span: 1 },
-                { value: 'NetAdvantage' , span: 2 }
-            ]);
-
-            // disable merge
-            col.merge = false;
-            fix.detectChanges();
 
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: null , span: 1 },
-                { value: 'NetAdvantage' , span: 1 },
-                { value: 'NetAdvantage' , span: 1 }
-            ]);
+        beforeEach(() => {
+            fix = TestBed.createComponent(DefaultCellMergeGridComponent);
+            fix.detectChanges();
+            grid = fix.componentInstance.grid;
         });
 
-        it('should always merge columns if mergeMode is always.', () => {
-            const col = grid.getColumnByName('Released');
-            col.merge = true;
-            fix.detectChanges();
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: true, span: 9 }
-            ]);
+        describe('Configuration', () => {
+
+            it('should allow enabling/disabling merging per column.', () => {
+
+                const col = grid.getColumnByName('ProductName');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 2 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                // disable merge
+                col.merge = false;
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 1 },
+                    { value: 'NetAdvantage', span: 1 }
+                ]);
+            });
+
+            it('should always merge columns if mergeMode is always.', () => {
+                const col = grid.getColumnByName('Released');
+                col.merge = true;
+                fix.detectChanges();
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: true, span: 9 }
+                ]);
+            });
+
+            it('should merge only sorted columns if mergeMode is onSort.', () => {
+                grid.cellMergeMode = 'onSort';
+                fix.detectChanges();
+                const col = grid.getColumnByName('ProductName');
+                //nothing is merged initially
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 1 },
+                    { value: 'NetAdvantage', span: 1 }
+                ]);
+
+                grid.sort({ fieldName: 'ProductName', dir: SortingDirection.Desc, ignoreCase: false });
+                fix.detectChanges();
+
+                // merge only after sorted
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'NetAdvantage', span: 2 },
+                    { value: 'Ignite UI for JavaScript', span: 3 },
+                    { value: 'Ignite UI for Angular', span: 3 },
+                    { value: null, span: 1 }
+                ]);
+            });
+
+            it('should allow setting a custom merge strategy via mergeStrategy on grid.', () => {
+                grid.mergeStrategy = new NoopMergeStrategy();
+                fix.detectChanges();
+                const col = grid.getColumnByName('ProductName');
+                // this strategy does no merging
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 1 },
+                    { value: 'NetAdvantage', span: 1 }
+                ]);
+            });
+
+            it('should allow setting a custom comparer for merging on particular column via mergingComparer.', () => {
+                const col = grid.getColumnByName('ProductName');
+                // all are same and should merge
+                col.mergingComparer = (prev: any, rec: any, field: string) => {
+                    return true;
+                };
+                grid.pipeTrigger += 1;
+                fix.detectChanges();
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 9 }
+                ]);
+            });
         });
 
-        it('should merge only sorted columns if mergeMode is onSort.', () => {
-            grid.cellMergeMode = 'onSort';
-            fix.detectChanges();
-            const col = grid.getColumnByName('ProductName');
-            //nothing is merged initially
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: null , span: 1 },
-                { value: 'NetAdvantage' , span: 1 },
-                { value: 'NetAdvantage' , span: 1 }
-            ]);
-
-            grid.sort({ fieldName: 'ProductName', dir: SortingDirection.Desc, ignoreCase: false });
-            fix.detectChanges();
+        describe('UI', () => {
+            it('should properly align merged cells with their spanned rows.', () => {
+                const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
+                const endRow = fix.debugElement.queryAll(By.css(CSS_CLASS_GRID_ROW))[2].nativeNode;
+                expect(mergedCell.getBoundingClientRect().bottom).toBe(endRow.getBoundingClientRect().bottom);
+            });
+
+            it('should mark merged cell as hovered when hovering any row that intersects that cell.', () => {
+                const secondRow = fix.debugElement.queryAll(By.css(CSS_CLASS_GRID_ROW))[2];
+                UIInteractions.hoverElement(secondRow.nativeNode);
+                fix.detectChanges();
+                // hover 2nd row that intersects the merged cell in row 1
+                const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
+                // merged cell should be marked as hovered
+                hasClass(mergedCell, 'igx-grid__td--merged-hovered', true);
+            });
 
-            // merge only after sorted
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: 'NetAdvantage' , span: 2 },
-                { value: 'Ignite UI for JavaScript', span: 3 },
-                { value: 'Ignite UI for Angular', span: 3 },
-                { value: null , span: 1 }
-            ]);
+            it('should set correct size to merged cell that spans multiple rows that have different sizes.', () => {
+                const col = grid.getColumnByName('ID');
+                col.bodyTemplate = fix.componentInstance.customTemplate;
+                fix.detectChanges();
+                grid.verticalScrollContainer.recalcUpdateSizes();
+                grid.dataRowList.toArray().forEach(x => x.cdr.detectChanges());
+                const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
+                // one row is 100px, other is 200, 4px border
+                expect(mergedCell.getBoundingClientRect().height).toBe(100 + 200 + 4);
+            });
         });
+    });
 
-        it('should allow setting a custom merge strategy via mergeStrategy on grid.', () => {
-            grid.mergeStrategy = new NoopMergeStrategy();
+    describe('Integration', () => {
+        beforeEach(() => {
+            fix = TestBed.createComponent(IntegrationCellMergeGridComponent);
             fix.detectChanges();
-            const col = grid.getColumnByName('ProductName');
-            // this strategy does no merging
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for JavaScript', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: 'Ignite UI for Angular', span: 1 },
-                { value: null , span: 1 },
-                { value: 'NetAdvantage' , span: 1 },
-                { value: 'NetAdvantage' , span: 1 }
-            ]);
+            grid = fix.componentInstance.grid;
         });
 
-        it('should allow setting a custom comparer for merging on particular column via mergingComparer.', () => {
-            const col = grid.getColumnByName('ProductName');
-            // all are same and should merge
-            col.mergingComparer = (prev:any, rec: any, field: string) => {
-                return true;
-            };
-            grid.pipeTrigger += 1;
-            fix.detectChanges();
-            GridFunctions.verifyColumnMergedState(grid, col, [
-                { value: 'Ignite UI for JavaScript', span: 9 }
-            ]);
+        describe('Virtualization', () => {
+            beforeEach(() => {
+                fix.componentInstance.width = '400px';
+                fix.componentInstance.height = '300px';
+                fix.detectChanges();
+            });
+            it('should retain rows with merged cells that span multiple rows in DOM as long as merged cell is still in view.',  async() => {
+                // initial row list is same as the virtualization chunk
+                expect(grid.rowList.length).toBe(grid.virtualizationState.chunkSize);
+
+                grid.navigateTo(grid.virtualizationState.chunkSize - 1, 0);
+                await wait(100);
+                fix.detectChanges();
+
+                //virtualization starts from 1
+                expect(grid.virtualizationState.startIndex).toBe(1);
+
+                // check row is chunkSize + 1 extra row at the top
+                expect(grid.rowList.length).toBe(grid.virtualizationState.chunkSize + 1);
+                // first row at top is index 0
+                expect(grid.rowList.first.index).toBe(0);
+                // and has offset to position correctly the merged cell
+                expect(grid.rowList.first.nativeElement.offsetTop).toBeLessThan(-50);
+            });
+
+            it('should remove row from DOM when merged cell is no longer in view.', async() => {
+                // scroll so that first row with merged cell is not in view
+                grid.navigateTo(grid.virtualizationState.chunkSize, 0);
+                await wait(100);
+                fix.detectChanges();
+
+                 //virtualization starts from 2
+                 expect(grid.virtualizationState.startIndex).toBe(2);
+
+                 // no merge cells from previous chunks
+                 expect(grid.rowList.length).toBe(grid.virtualizationState.chunkSize);
+                 // first row is from the virtualization
+                 expect(grid.rowList.first.index).toBe(grid.virtualizationState.startIndex);
+            });
+
+            it('horizontal virtualization should not be affected by vertically merged cells.', async() => {
+                let mergedCell = grid.rowList.first.cells.find(x => x.column.field === 'ProductName');
+                expect(mergedCell.value).toBe('Ignite UI for JavaScript');
+                expect(mergedCell.nativeElement.parentElement.style.gridTemplateRows).toBe("51px 51px");
+
+                // scroll horizontally
+                grid.navigateTo(0, 4);
+                await wait(100);
+                fix.detectChanges();
+
+                // not in DOM
+                mergedCell = grid.rowList.first.cells.find(x => x.column.field === 'ProductName');
+                expect(mergedCell).toBeUndefined();
+
+                // scroll back
+                grid.navigateTo(0, 0);
+                await wait(100);
+                fix.detectChanges();
+
+                mergedCell = grid.rowList.first.cells.find(x => x.column.field === 'ProductName');
+                expect(mergedCell.value).toBe('Ignite UI for JavaScript');
+                expect(mergedCell.nativeElement.parentElement.style.gridTemplateRows).toBe("51px 51px");
+            });
         });
-    });
 
+        describe('Group By', () => {
+            it('cells should merge only within their respective groups.', () => {
+                grid.groupBy({
+                    fieldName: 'ProductName', dir: SortingDirection.Desc,
+                    ignoreCase: false, strategy: DefaultSortingStrategy.instance()
+                });
+                fix.detectChanges();
+
+                const col = grid.getColumnByName('ProductName');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'NetAdvantage', span: 2 },
+                    { value: 'Ignite UI for JavaScript', span: 3 },
+                    { value: 'Ignite UI for Angular', span: 3 },
+                    { value: null, span: 1 }
+                ]);
+
+                grid.groupBy({
+                    fieldName: 'ReleaseDate', dir: SortingDirection.Desc,
+                    ignoreCase: false, strategy: DefaultSortingStrategy.instance()
+                });
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'NetAdvantage', span: 1 },
+                    { value: 'NetAdvantage', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 }
+                ]);
+
+            });
 
-    describe('UI', () => {
-        it ('should properly align merged cells with their spanned rows.', () => {
-            const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
-            const endRow = fix.debugElement.queryAll(By.css(CSS_CLASS_GRID_ROW))[2].nativeNode;
-            expect(mergedCell.getBoundingClientRect().bottom).toBe(endRow.getBoundingClientRect().bottom);
         });
 
-        it('should mark merged cell as hovered when hovering any row that intersects that cell.', () => {
-            const secondRow = fix.debugElement.queryAll(By.css(CSS_CLASS_GRID_ROW))[2];
-            UIInteractions.hoverElement(secondRow.nativeNode);
-            fix.detectChanges();
-            // hover 2nd row that intersects the merged cell in row 1
-            const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
-            // merged cell should be marked as hovered
-            hasClass(mergedCell, 'igx-grid__td--merged-hovered', true);
+        describe('Master-Detail', () => {
+
+            it('should interrupt merge sequence if a master-detail row is expanded.', () => {
+                grid.detailTemplate = fix.componentInstance.detailTemplate;
+                fix.detectChanges();
+
+                const col = grid.getColumnByName('ProductName');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 2 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                GridFunctions.toggleMasterRow(fix, grid.rowList.first);
+                fix.detectChanges();
+
+                // should slit first merge group in 2
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
+
+
         });
 
-        it('should set correct size to merged cell that spans multiple rows that have different sizes.', () => {
-            const col = grid.getColumnByName('ID');
-            col.bodyTemplate = fix.componentInstance.customTemplate;
-            fix.detectChanges();
-            grid.verticalScrollContainer.recalcUpdateSizes();
-            grid.dataRowList.toArray().forEach(x => x.cdr.detectChanges());
-            const mergedCell = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS))[0].nativeNode;
-            // one row is 100px, other is 200, 4px border
-            expect(mergedCell.getBoundingClientRect().height).toBe(100 + 200 + 4);
+        describe('Paging', () => {
+            it('should merge cells only on current page of data.', () => {
+                fix.componentInstance.paging = true;
+                fix.detectChanges();
+                grid.triggerPipes();
+                fix.detectChanges();
+
+                const col = grid.getColumnByName('ProductName');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 2 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 }
+                ]);
 
+                grid.page = 2;
+                fix.detectChanges();
 
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
         });
+
+        describe('Column Pinning', () => {
+            it('should merge cells in pinned columns.', () => {
+                const col = grid.getColumnByName('ProductName');
+                col.pinned = true;
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 2 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                const mergedCell = grid.rowList.first.cells.find(x => x.column.field === 'ProductName');
+                expect(mergedCell.value).toBe('Ignite UI for JavaScript');
+                expect(mergedCell.nativeElement.parentElement.style.gridTemplateRows).toBe("51px 51px");
+            });
+        });
+
     });
 });
 
@@ -183,11 +378,11 @@ export class DefaultCellMergeGridComponent extends DataParent {
     public customTemplate: TemplateRef<any>;
 
     public cols = [
-        { field:'ID', merge: false },
-        { field:'ProductName', dataType: GridColumnDataType.String, merge: true },
-        { field:'Downloads', dataType: GridColumnDataType.Number, merge: false },
-        { field:'Released', dataType: GridColumnDataType.Boolean, merge: false },
-        { field:'ReleaseDate', dataType: GridColumnDataType.Date, merge: false }
+        { field: 'ID', merge: false },
+        { field: 'ProductName', dataType: GridColumnDataType.String, merge: true },
+        { field: 'Downloads', dataType: GridColumnDataType.Number, merge: false },
+        { field: 'Released', dataType: GridColumnDataType.Boolean, merge: false },
+        { field: 'ReleaseDate', dataType: GridColumnDataType.Date, merge: false }
     ];
 
     public override data = [
@@ -258,13 +453,38 @@ export class DefaultCellMergeGridComponent extends DataParent {
 
 }
 
+@Component({
+    template: `
+        <igx-grid [data]="data" [cellMergeMode]="mergeMode" #grid [height]="height" [width]="width">
+        @for(col of cols; track col) {
+            <igx-column width="200px" [field]="col.field" [dataType]="col.dataType" [merge]="col.merge"></igx-column>
+        }
+        @if (paging) {
+            <igx-paginator [perPage]="5"></igx-paginator>
+        }
+        </igx-grid>
+        <ng-template #detailTemplate>
+            <button>Detail</button>
+        </ng-template>
+    `,
+    imports: [IgxGridComponent, IgxColumnComponent, IgxPaginatorComponent]
+})
+export class IntegrationCellMergeGridComponent extends DefaultCellMergeGridComponent {
+    public height = '100%';
+    public width = '100%';
+    public paging = false;
+
+    @ViewChild('detailTemplate', { read: TemplateRef, static: true })
+    public detailTemplate: TemplateRef<any>;
+}
+
 class NoopMergeStrategy extends DefaultMergeStrategy {
     public override merge(
         data: any[],
         field: string,
         comparer: (prevRecord: any, record: any, field: string) => boolean = this.comparer,
         result: any[],
-        activeRowIndexes : number[],
+        activeRowIndexes: number[],
         grid?: GridType
     ) {
         return data;

From 46ea7ae3cf27f111415fccde2151fa52556cbdae Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 23 Jul 2025 14:09:14 +0300
Subject: [PATCH 47/54] chore(*): Add more integration tests.

---
 .../src/lib/grids/grid/cell-merge.spec.ts     | 186 +++++++++++++++++-
 .../src/lib/grids/row.directive.ts            |   2 +-
 2 files changed, 186 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
index 87710439b54..0229ef9af01 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -3,7 +3,7 @@ import { fakeAsync, TestBed, tick, waitForAsync } from '@angular/core/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
 import { DefaultMergeStrategy, DefaultSortingStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, IgxPaginatorComponent, SortingDirection } from 'igniteui-angular';
 import { DataParent } from '../../test-utils/sample-test-data.spec';
-import { GridFunctions } from '../../test-utils/grid-functions.spec';
+import { GridFunctions, GridSelectionFunctions } from '../../test-utils/grid-functions.spec';
 import { By } from '@angular/platform-browser';
 import { UIInteractions, wait } from '../../test-utils/ui-interactions.spec';
 import { hasClass } from '../../test-utils/helper-utils.spec';
@@ -353,6 +353,190 @@ describe('IgxGrid - Cell merging #grid', () => {
             });
         });
 
+        describe('Row Pinning', () => {
+            it('should merge adjacent pinned rows in pinned row area.', () => {
+                const row1 = grid.rowList.toArray()[0];
+                const row2 = grid.rowList.toArray()[1];
+                const col = grid.getColumnByName('ProductName');
+                row1.pin();
+                row2.pin();
+                fix.detectChanges();
+
+                expect(grid.pinnedRows.length).toBe(2);
+                const pinnedRow =  grid.pinnedRows[0];
+                expect(pinnedRow.metaData.cellMergeMeta.get(col.field)?.rowSpan).toBe(2);
+                const mergedPinnedCell = pinnedRow.cells.find(x => x.column.field === 'ProductName');
+                expect(mergedPinnedCell.value).toBe('Ignite UI for JavaScript');
+                expect(mergedPinnedCell.nativeElement.parentElement.style.gridTemplateRows).toBe("51px 51px");
+            });
+
+            it('should merge adjacent ghost rows in unpinned area.', () => {
+                const row1 = grid.rowList.toArray()[0];
+                const row2 = grid.rowList.toArray()[1];
+                const col = grid.getColumnByName('ProductName');
+                row1.pin();
+                row2.pin();
+                fix.detectChanges();
+
+                const ghostRows = grid.rowList.filter(x => x.disabled);
+                expect(ghostRows.length).toBe(2);
+                const ghostRow = ghostRows[0];
+                expect(ghostRow.metaData.cellMergeMeta.get(col.field)?.rowSpan).toBe(2);
+                const mergedPinnedCell = ghostRow.cells.find(x => x.column.field === 'ProductName');
+                expect(mergedPinnedCell.value).toBe('Ignite UI for JavaScript');
+                expect(mergedPinnedCell.nativeElement.parentElement.style.gridTemplateRows).toBe("51px 51px");
+            });
+
+            it('should not merge ghost and data rows together.', () => {
+                const col = grid.getColumnByName('ProductName');
+                const row1 = grid.rowList.toArray()[0];
+                row1.pin();
+                fix.detectChanges();
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
+        });
+
+        describe('Activation', () => {
+
+            it('should interrupt merge sequence so that active row has no merging.', () => {
+                const col = grid.getColumnByName('ProductName');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 2 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                const row1 = grid.rowList.toArray()[0];
+
+                UIInteractions.simulateClickAndSelectEvent(row1.cells.toArray()[1].nativeElement);
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
+
+        });
+
+        describe('Updating', () => {
+
+            beforeEach(() => {
+                grid.primaryKey = 'ID';
+                grid.columns.forEach(x => x.editable = true);
+                fix.detectChanges();
+            });
+
+            it('should edit the individual row values for the active row.', () => {
+                const col = grid.getColumnByName('ProductName');
+                grid.rowEditable = true;
+                fix.detectChanges();
+
+                const row = grid.gridAPI.get_row_by_index(0);
+                const cell = grid.gridAPI.get_cell_by_index(0, 'ProductName');
+                UIInteractions.simulateDoubleClickAndSelectEvent(cell.nativeElement);
+                fix.detectChanges();
+                expect(row.inEditMode).toBe(true);
+
+                // row in edit is not merged anymore
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                // enter new val
+                const cellInput =  grid.gridAPI.get_cell_by_index(0, 'ProductName').nativeElement.querySelector('[igxinput]');
+                UIInteractions.setInputElementValue(cellInput, "NewValue");
+                fix.detectChanges();
+
+                // Done button click
+                const doneButtonElement = GridFunctions.getRowEditingDoneButton(fix);
+                doneButtonElement.click();
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'NewValue', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
+
+            it('should edit the individual cell value for the active row.', () => {
+                const col = grid.getColumnByName('ProductName');
+                let cell = grid.gridAPI.get_cell_by_index(0, 'ProductName');
+
+                UIInteractions.simulateDoubleClickAndSelectEvent(cell.nativeElement);
+                fix.detectChanges();
+
+                cell = grid.gridAPI.get_cell_by_index(0, 'ProductName');
+                expect(cell.editMode).toBe(true);
+
+                // enter new val
+                const cellInput =  grid.gridAPI.get_cell_by_index(0, 'ProductName').nativeElement.querySelector('[igxinput]');
+                UIInteractions.setInputElementValue(cellInput, "NewValue");
+                fix.detectChanges();
+
+                UIInteractions.triggerEventHandlerKeyDown('enter', GridFunctions.getGridContent(fix));
+                fix.detectChanges();
+
+                 // row with edit cell is not merged anymore
+                 GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'NewValue', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
+        });
+        describe('Row Selection', () => {
+
+            it('should mark all merged cells that intersect with a selected row as selected.', () => {
+                grid.rowSelection = 'multiple';
+                fix.detectChanges();
+
+                const secondRow = grid.rowList.toArray()[1];
+                GridSelectionFunctions.clickRowCheckbox(secondRow);
+                fix.detectChanges();
+
+                expect(secondRow.selected).toBe(true);
+                grid.markForCheck();
+
+                const mergedIntersectedCell = grid.gridAPI.get_cell_by_index(0, 'ProductName');
+                // check cell has selected style
+                hasClass(mergedIntersectedCell.nativeElement,'igx-grid__td--merged-selected', true);
+            });
+
+        });
+
     });
 });
 
diff --git a/projects/igniteui-angular/src/lib/grids/row.directive.ts b/projects/igniteui-angular/src/lib/grids/row.directive.ts
index 0e6c12ef6b7..a7bf2a10cb7 100644
--- a/projects/igniteui-angular/src/lib/grids/row.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/row.directive.ts
@@ -628,7 +628,7 @@ export class IgxRowDirective implements DoCheck, AfterViewInit, OnDestroy {
         if (mergeMeta && rowCount > 1) {
             const indexInData = this.pinned && this.grid.isRowPinningToTop ? this.index - this.grid.pinnedRecordsCount : this.index;
             const range = this.grid.verticalScrollContainer.igxForOf.slice(indexInData, indexInData + rowCount);
-            const inRange = range.filter(x => this.selectionService.isRowSelected(this.grid.primaryKey ? (x.recordRef || x)[this.grid.primaryKey] : (x.recordRef || x).recordRef)).length > 0;
+            const inRange = range.filter(x => this.selectionService.isRowSelected(this.grid.primaryKey ? (x.recordRef || x)[this.grid.primaryKey] : (x.recordRef || x))).length > 0;
             return inRange;
         }
         return false;

From f8624690fd01254b48b0ca8a33729e0f856b283f Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Wed, 23 Jul 2025 16:02:36 +0300
Subject: [PATCH 48/54] chore(*): Add more integration tests.

---
 .../src/lib/grids/grid/cell-merge.spec.ts     | 146 +++++++++++++++++-
 1 file changed, 143 insertions(+), 3 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
index 0229ef9af01..5b0df570546 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -1,12 +1,13 @@
 import { Component, TemplateRef, ViewChild } from '@angular/core';
 import { fakeAsync, TestBed, tick, waitForAsync } from '@angular/core/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
-import { DefaultMergeStrategy, DefaultSortingStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, IgxPaginatorComponent, SortingDirection } from 'igniteui-angular';
+import { DefaultMergeStrategy, DefaultSortingStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, IgxPaginatorComponent, IgxStringFilteringOperand, SortingDirection } from 'igniteui-angular';
 import { DataParent } from '../../test-utils/sample-test-data.spec';
 import { GridFunctions, GridSelectionFunctions } from '../../test-utils/grid-functions.spec';
 import { By } from '@angular/platform-browser';
 import { UIInteractions, wait } from '../../test-utils/ui-interactions.spec';
 import { hasClass } from '../../test-utils/helper-utils.spec';
+import { ColumnLayoutTestComponent } from './grid.multi-row-layout.spec';
 
 describe('IgxGrid - Cell merging #grid', () => {
     let fix;
@@ -14,10 +15,12 @@ describe('IgxGrid - Cell merging #grid', () => {
     const MERGE_CELL_CSS_CLASS = '.igx-grid__td--merged';
     const CELL_CSS_CLASS = '.igx-grid__td';
     const CSS_CLASS_GRID_ROW = '.igx-grid__tr';
+    const HIGHLIGHT_ACTIVE_CSS_CLASS = '.igx-highlight__active';
+
     beforeEach(waitForAsync(() => {
         TestBed.configureTestingModule({
             imports: [
-                NoopAnimationsModule, DefaultCellMergeGridComponent
+                NoopAnimationsModule, DefaultCellMergeGridComponent, ColumnLayoutTestComponent
             ]
         }).compileComponents();
     }));
@@ -517,6 +520,7 @@ describe('IgxGrid - Cell merging #grid', () => {
                 ]);
             });
         });
+
         describe('Row Selection', () => {
 
             it('should mark all merged cells that intersect with a selected row as selected.', () => {
@@ -528,7 +532,6 @@ describe('IgxGrid - Cell merging #grid', () => {
                 fix.detectChanges();
 
                 expect(secondRow.selected).toBe(true);
-                grid.markForCheck();
 
                 const mergedIntersectedCell = grid.gridAPI.get_cell_by_index(0, 'ProductName');
                 // check cell has selected style
@@ -537,6 +540,143 @@ describe('IgxGrid - Cell merging #grid', () => {
 
         });
 
+        describe('Cell Selection', () => {
+            it('should interrupt merge sequence so that selected cell has no merging.', () => {
+                const col = grid.getColumnByName('ProductName');
+                grid.cellSelection = 'multiple';
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 2 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 2 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                const startCell = grid.gridAPI.get_cell_by_index(4, 'ProductName');
+                const endCell = grid.gridAPI.get_cell_by_index(0, 'ID');
+
+                GridSelectionFunctions.selectCellsRangeNoWait(fix, startCell, endCell);
+                fix.detectChanges();
+
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for JavaScript', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: 'Ignite UI for Angular', span: 1 },
+                    { value: null, span: 1 },
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+
+                // check api
+                expect(grid.getSelectedData().length).toBe(5);
+                expect(grid.getSelectedData()).toEqual(grid.data.slice(0, 5).map(x => { return { 'ID': x.ID, 'ProductName': x. ProductName}}));
+            });
+        });
+
+        describe('Column selection', () => {
+            it('should mark merged cells in selected column as selected.', () => {
+                grid.columnSelection = 'multiple';
+                fix.detectChanges();
+                const col = grid.getColumnByName('ProductName');
+                col.selected = true;
+                fix.detectChanges();
+
+                const mergedCells = fix.debugElement.queryAll(By.css(MERGE_CELL_CSS_CLASS));
+                mergedCells.forEach(element => {
+                    hasClass(element.nativeNode, 'igx-grid__td--column-selected', true);
+                });
+            });
+
+            it('selected data API should return all associated data fields as selected.', () => {
+                grid.columnSelection = 'multiple';
+                fix.detectChanges();
+                const col = grid.getColumnByName('ProductName');
+                col.selected = true;
+                fix.detectChanges();
+
+                expect(grid.getSelectedColumnsData()).toEqual(grid.data.map(x => { return {'ProductName': x. ProductName}}));
+            });
+        });
+
+        describe('Filtering', () => {
+
+            it('should merge cells in filtered data.', () => {
+                grid.filter('ProductName', 'Net', IgxStringFilteringOperand.instance().condition('startsWith'), true);
+                fix.detectChanges();
+                const col = grid.getColumnByName('ProductName');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'NetAdvantage', span: 2 }
+                ]);
+            });
+
+        });
+
+        describe('Searching', () => {
+
+            it('findNext \ findPrev should count merged cells as 1 result and navigate once through them.', () => {
+                const cell0 = grid.gridAPI.get_cell_by_index(0, 'ProductName').nativeElement;
+                const cell3 = grid.gridAPI.get_cell_by_index(3, 'ProductName').nativeElement;
+                const fixNativeElem = fix.debugElement.nativeElement;
+
+                let matches = grid.findNext('JavaScript');
+                fix.detectChanges();
+
+                expect(matches).toBe(2);
+
+                let activeHighlight = fixNativeElem.querySelectorAll(HIGHLIGHT_ACTIVE_CSS_CLASS);
+                expect(activeHighlight[0].closest("igx-grid-cell")).toBe(cell0);
+
+                matches = grid.findNext('JavaScript');
+                fix.detectChanges();
+
+                activeHighlight = fixNativeElem.querySelectorAll(HIGHLIGHT_ACTIVE_CSS_CLASS);
+                expect(activeHighlight[0].closest("igx-grid-cell")).toBe(cell3);
+
+                matches = grid.findPrev('JavaScript');
+                fix.detectChanges();
+
+                activeHighlight = fixNativeElem.querySelectorAll(HIGHLIGHT_ACTIVE_CSS_CLASS);
+                expect(activeHighlight[0].closest("igx-grid-cell")).toBe(cell0);
+            });
+
+            it('should update matches if a cell becomes unmerged.', () => {
+                let matches = grid.findNext('JavaScript');
+                fix.detectChanges();
+
+                expect(matches).toBe(2);
+
+                UIInteractions.simulateClickAndSelectEvent(grid.gridAPI.get_cell_by_index(0, 'ProductName').nativeElement);
+                fix.detectChanges();
+
+                matches = grid.findNext('JavaScript');
+                fix.detectChanges();
+                expect(matches).toBe(3);
+            });
+
+        });
+
+        describe('Multi-row layout', () => {
+            it('should throw warning and disallow merging with mrl.', () => {
+                jasmine.getEnv().allowRespy(true);
+                fix = TestBed.createComponent(ColumnLayoutTestComponent);
+                fix.detectChanges();
+                grid = fix.componentInstance.grid;
+                spyOn(console, 'warn');
+                grid.columns[1].merge = true;
+                fix.detectChanges();
+
+                expect(console.warn).toHaveBeenCalledWith('Merging is not supported with multi-row layouts.');
+                expect(console.warn).toHaveBeenCalledTimes(1);
+                jasmine.getEnv().allowRespy(false);
+            });
+
+        });
+
     });
 });
 

From fc467396f89401c67edb5578b700d4ff47862737 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 24 Jul 2025 14:40:33 +0300
Subject: [PATCH 49/54] chore(*): Add Hgrid and TreeGrid integration tests.

---
 .../src/lib/grids/grid/cell-merge.spec.ts     | 209 +++++++++++++++++-
 1 file changed, 207 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
index 5b0df570546..8e8bb8e58fb 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -1,13 +1,16 @@
 import { Component, TemplateRef, ViewChild } from '@angular/core';
 import { fakeAsync, TestBed, tick, waitForAsync } from '@angular/core/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
-import { DefaultMergeStrategy, DefaultSortingStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, IgxPaginatorComponent, IgxStringFilteringOperand, SortingDirection } from 'igniteui-angular';
+import { ByLevelTreeGridMergeStrategy, DefaultMergeStrategy, DefaultSortingStrategy, GridCellMergeMode, GridColumnDataType, GridType, IgxColumnComponent, IgxGridComponent, IgxHierarchicalGridComponent, IgxPaginatorComponent, IgxStringFilteringOperand, SortingDirection } from 'igniteui-angular';
 import { DataParent } from '../../test-utils/sample-test-data.spec';
 import { GridFunctions, GridSelectionFunctions } from '../../test-utils/grid-functions.spec';
 import { By } from '@angular/platform-browser';
 import { UIInteractions, wait } from '../../test-utils/ui-interactions.spec';
 import { hasClass } from '../../test-utils/helper-utils.spec';
 import { ColumnLayoutTestComponent } from './grid.multi-row-layout.spec';
+import { IgxHierarchicalGridTestBaseComponent } from '../hierarchical-grid/hierarchical-grid.spec';
+import { IgxHierarchicalRowComponent } from '../hierarchical-grid/hierarchical-row.component';
+import { IgxTreeGridSelectionComponent } from '../../test-utils/tree-grid-components.spec';
 
 describe('IgxGrid - Cell merging #grid', () => {
     let fix;
@@ -20,7 +23,8 @@ describe('IgxGrid - Cell merging #grid', () => {
     beforeEach(waitForAsync(() => {
         TestBed.configureTestingModule({
             imports: [
-                NoopAnimationsModule, DefaultCellMergeGridComponent, ColumnLayoutTestComponent
+                NoopAnimationsModule, DefaultCellMergeGridComponent, ColumnLayoutTestComponent,
+                IgxHierarchicalGridTestBaseComponent, IgxTreeGridSelectionComponent
             ]
         }).compileComponents();
     }));
@@ -677,6 +681,207 @@ describe('IgxGrid - Cell merging #grid', () => {
 
         });
 
+        describe('HierarchicalGrid', () => {
+
+            beforeEach(() => {
+                fix = TestBed.createComponent(IgxHierarchicalGridTestBaseComponent);
+                fix.componentInstance.data = [
+                    {
+                        ID: 1, ChildLevels: 1,  ProductName: 'Product A' , Col1: 1,
+                        childData: [
+                            {
+                                ID: 1, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            },
+                            {
+                                ID: 2, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            },
+                            {
+                                ID: 3, ChildLevels: 2,  ProductName: 'Product B' , Col1: 1,
+                            },
+                            {
+                                ID: 4, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            }
+                        ]
+                    },
+                    {
+                        ID: 2, ChildLevels: 1,  ProductName: 'Product A' , Col1: 1, childData: [
+                            {
+                                ID: 1, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            },
+                            {
+                                ID: 2, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            },
+                            {
+                                ID: 3, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            },
+                            {
+                                ID: 4, ChildLevels: 2,  ProductName: 'Product A' , Col1: 1,
+                            }
+                        ]
+                    },
+                    {
+                        ID: 3, ChildLevels: 1,  ProductName: 'Product B' , Col1: 1
+                    },
+                    {
+                        ID: 4, ChildLevels: 1,  ProductName: 'Product B' , Col1: 1
+                    },
+                    {
+                        ID: 5, ChildLevels: 1,  ProductName: 'Product C' , Col1: 1
+                    },
+                    {
+                        ID: 6, ChildLevels: 1,  ProductName: 'Product B' , Col1: 1
+                    }
+                ];
+                fix.detectChanges();
+                grid = fix.componentInstance.hgrid;
+                // enable merging
+                grid.cellMergeMode = 'always';
+                const col = grid.getColumnByName('ProductName');
+                col.merge = true;
+                fix.detectChanges();
+            });
+
+            it('should allow configuring and merging cells on each level of hierarchy.', () => {
+
+                const col = grid.getColumnByName('ProductName');
+                // root grid should be merged
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Product A', span: 2 },
+                    { value: 'Product B', span: 2 },
+                    { value: 'Product C', span: 1 },
+                    { value: 'Product B', span: 1 }
+                ]);
+
+                const ri = fix.componentInstance.rowIsland;
+                ri.cellMergeMode = 'always';
+                ri.getColumnByName('ProductName').merge = true;
+                fix.detectChanges();
+
+                // toggle row
+                const firstRow = grid.gridAPI.get_row_by_index(0) as IgxHierarchicalRowComponent;
+                firstRow.toggle();
+                fix.detectChanges();
+
+                const childGrid = grid.gridAPI.getChildGrids(false)[0] as IgxHierarchicalGridComponent;
+                expect(childGrid).toBeDefined();
+
+                // merging enabled
+                GridFunctions.verifyColumnMergedState(childGrid, childGrid.getColumnByName('ProductName'), [
+                    { value: 'Product A', span: 2 },
+                    { value: 'Product B', span: 1 },
+                    { value: 'Product A', span: 1 }
+                ]);
+            });
+
+            it('should merge cells within their respective grids only.', () => {
+                const ri = fix.componentInstance.rowIsland;
+                ri.cellMergeMode = 'always';
+                ri.getColumnByName('ProductName').merge = true;
+                fix.detectChanges();
+
+                // toggle row 1
+                const firstRow = grid.gridAPI.get_row_by_index(0) as IgxHierarchicalRowComponent;
+                firstRow.toggle();
+                fix.detectChanges();
+
+                // toggle row 2
+                const secondRow = grid.gridAPI.get_row_by_index(2) as IgxHierarchicalRowComponent;
+                secondRow.toggle();
+                fix.detectChanges();
+
+                const childGrid1 = grid.gridAPI.getChildGrids(false)[0] as IgxHierarchicalGridComponent;
+                expect(childGrid1).toBeDefined();
+
+                GridFunctions.verifyColumnMergedState(childGrid1, childGrid1.getColumnByName('ProductName'), [
+                    { value: 'Product A', span: 2 },
+                    { value: 'Product B', span: 1 },
+                    { value: 'Product A', span: 1 }
+                ]);
+
+                const childGrid2 = grid.gridAPI.getChildGrids(false)[1] as IgxHierarchicalGridComponent;
+                expect(childGrid2).toBeDefined();
+
+                GridFunctions.verifyColumnMergedState(childGrid2, childGrid2.getColumnByName('ProductName'), [
+                    { value: 'Product A', span: 4 }
+                ]);
+            });
+
+            it('should interrupt merge sequence if row is expanded and a child grid is shown between same value cells.', () => {
+                const col = grid.getColumnByName('ProductName');
+                // root grid should be merged
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Product A', span: 2 },
+                    { value: 'Product B', span: 2 },
+                    { value: 'Product C', span: 1 },
+                    { value: 'Product B', span: 1 }
+                ]);
+
+                // toggle row 1
+                const firstRow = grid.gridAPI.get_row_by_index(0) as IgxHierarchicalRowComponent;
+                firstRow.toggle();
+                fix.detectChanges();
+
+                // first merge sequence interrupted due to expanded row
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: 'Product A', span: 1 },
+                    { value: 'Product A', span: 1 },
+                    { value: 'Product B', span: 2 },
+                    { value: 'Product C', span: 1 },
+                    { value: 'Product B', span: 1 }
+                ]);
+            });
+
+        });
+
+        describe('TreeGrid', () => {
+
+            beforeEach(() => {
+                fix = TestBed.createComponent(IgxTreeGridSelectionComponent);
+                fix.detectChanges();
+                grid = fix.componentInstance.treeGrid;
+                // enable merging
+                grid.cellMergeMode = 'always';
+                const col = grid.getColumnByName('OnPTO');
+                col.merge = true;
+                fix.detectChanges();
+            });
+
+            it('should merge all cells with same values, even if on different levels by default.', () => {
+                const col = grid.getColumnByName('OnPTO');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: false, span: 2 },
+                    { value: true, span: 1 },
+                    { value: false, span: 1 },
+                    { value: true, span: 1 },
+                    { value: false, span: 2 },
+                    { value: true, span: 1 },
+                    { value: false, span: 3 },
+                    { value: true, span: 1 }
+                ]);
+            });
+
+            it('should allow setting the ByLevelTreeGridMergeStrategy as the mergeStrategy to merge only data on the same hierarchy level.', () => {
+                grid.mergeStrategy = new ByLevelTreeGridMergeStrategy();
+                fix.detectChanges();
+                grid.triggerPipes();
+                fix.detectChanges();
+                const col = grid.getColumnByName('OnPTO');
+                GridFunctions.verifyColumnMergedState(grid, col, [
+                    { value: false, span: 1 },
+                    { value: false, span: 1 },
+                    { value: true, span: 1 },
+                    { value: false, span: 1 },
+                    { value: true, span: 1 },
+                    { value: false, span: 1 },
+                    { value: false, span: 1 },
+                    { value: true, span: 1 },
+                    { value: false, span: 1 },
+                    { value: false, span: 1 },
+                    { value: false, span: 1 },
+                    { value: true, span: 1 }
+                ]);
+            });
+        });
     });
 });
 

From ea9baa684dfa247b46b8d2c76d43dd98e5460b9b Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 24 Jul 2025 14:43:14 +0300
Subject: [PATCH 50/54] chore(*): Fix lint i tests.

---
 .../src/lib/grids/grid/cell-merge.spec.ts                 | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
index 8e8bb8e58fb..0493bdef316 100644
--- a/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid/cell-merge.spec.ts
@@ -578,7 +578,9 @@ describe('IgxGrid - Cell merging #grid', () => {
 
                 // check api
                 expect(grid.getSelectedData().length).toBe(5);
-                expect(grid.getSelectedData()).toEqual(grid.data.slice(0, 5).map(x => { return { 'ID': x.ID, 'ProductName': x. ProductName}}));
+                expect(grid.getSelectedData()).toEqual(grid.data.slice(0, 5).map(x => {
+                    return { 'ID': x.ID, 'ProductName': x. ProductName};
+                }));
             });
         });
 
@@ -603,7 +605,9 @@ describe('IgxGrid - Cell merging #grid', () => {
                 col.selected = true;
                 fix.detectChanges();
 
-                expect(grid.getSelectedColumnsData()).toEqual(grid.data.map(x => { return {'ProductName': x. ProductName}}));
+                expect(grid.getSelectedColumnsData()).toEqual(grid.data.map(x => {
+                    return {'ProductName': x. ProductName};
+                }));
             });
         });
 

From 1f4c5543152a7365aee0a474aff59ca7e0451710 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 24 Jul 2025 15:07:16 +0300
Subject: [PATCH 51/54] chore(*): Update Changelog.

---
 CHANGELOG.md | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a5d8b720cf..1ea27757245 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,34 @@
 
 All notable changes for each version of this project will be documented in this file.
 
+## 20.1.0
+
+### New Features
+
+- `IgxGrid`, `IgxTreeGrid`, `IgxHierarchicalGrid`
+    - Introduced a new cell merging feature that allows you to configure and merge cells in a column based on same data or other custom condition, into a single cell.
+    
+     It can be enabled on the individual columns:
+
+    ```html
+            <igx-column field="field" [merge]="true"></igx-column>
+    ```
+    The merging can be configured on the grid level to apply either:
+    - `onSort` - only when the column is sorted.
+    - `always` - always, regardless of data operations.
+
+    ```html
+        <igx-grid [cellMergeMode]="'always'">
+        </igx-grid>
+    ```
+
+    The default `cellMergeMode` is `onSort`.
+
+    The functionality can be modified by setting a custom `mergeStrategy` on the grid, in case some other merge conditions or logic is needed for a custom scenario.
+
+    It's possible also to set a `mergeComparer` on the individual columns, in case some custom handling is needed for a particular data field.
+
+
 ## 20.0.0
 
 ### General

From cc478207714eacca4dde0359dc7f89c2e99960af Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 24 Jul 2025 16:11:36 +0300
Subject: [PATCH 52/54] chore(*): Fix unrelated respy issue in combo tests.

---
 .../src/lib/simple-combo/simple-combo.component.spec.ts         | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts b/projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts
index d14691194bb..f72b08c7292 100644
--- a/projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts
+++ b/projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts
@@ -532,6 +532,7 @@ describe('IgxSimpleCombo', () => {
         });
 
         it('should delete the selection on destroy', () => {
+            jasmine.getEnv().allowRespy(true);
             const selectionService = new IgxSelectionAPIService();
             const comboClearSpy = spyOn(mockComboService, 'clear');
             const selectionDeleteSpy = spyOn(selectionService, 'delete');
@@ -548,6 +549,7 @@ describe('IgxSimpleCombo', () => {
             combo.ngOnDestroy();
             expect(comboClearSpy).toHaveBeenCalled();
             expect(selectionDeleteSpy).toHaveBeenCalled();
+            jasmine.getEnv().allowRespy(false);
         });
     });
 

From 35a1bde653e04b8f282497ce8198479d2a853525 Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Thu, 24 Jul 2025 16:57:51 +0300
Subject: [PATCH 53/54] chore(*): Fix hardcoded value in unrelated test.

---
 .../src/lib/query-builder/query-builder.component.spec.ts       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/projects/igniteui-angular/src/lib/query-builder/query-builder.component.spec.ts b/projects/igniteui-angular/src/lib/query-builder/query-builder.component.spec.ts
index 8a1e2af8635..38f0578a17e 100644
--- a/projects/igniteui-angular/src/lib/query-builder/query-builder.component.spec.ts
+++ b/projects/igniteui-angular/src/lib/query-builder/query-builder.component.spec.ts
@@ -773,7 +773,7 @@ describe('IgxQueryBuilder', () => {
       // Verify value input placeholder
       const input = QueryBuilderFunctions.getQueryBuilderValueInput(fix).querySelector('input');
       // Verify value input placeholder
-      expect(input.placeholder).toEqual('Select date');
+      expect(input.placeholder).toEqual(queryBuilder.resourceStrings.igx_query_builder_date_placeholder);
 
       QueryBuilderFunctions.verifyEditModeExpressionInputStates(fix, true, true, false, true); // Third input should be disabled for unary operators.
       // Commit the populated expression.

From a7970d126246a35165c2cbdcf61c48ffbd2485fb Mon Sep 17 00:00:00 2001
From: MKirova <MKirova@DEV-MKIROVA>
Date: Fri, 25 Jul 2025 11:55:06 +0300
Subject: [PATCH 54/54] chore(*): Improve samples a bit.

---
 .../styles/components/grid/_grid-theme.scss   |    2 +
 .../grid-cellMerging.component.html           |   45 +-
 .../grid-cellMerging.component.scss           |    3 +
 .../grid-cellMerging.component.ts             |  343 +-
 src/app/shared/invoiceData.ts                 | 8081 +++++++++++++++++
 5 files changed, 8113 insertions(+), 361 deletions(-)
 create mode 100644 src/app/shared/invoiceData.ts

diff --git a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
index 5f5df28fc9c..4537aa86c68 100644
--- a/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
+++ b/projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss
@@ -1178,6 +1178,7 @@
 
         %grid-row--mrl {
             %igx-grid__hierarchical-expander--header,
+            %igx-grid__hierarchical-expander,
             %igx-grid__header-indentation,
             %igx-grid__row-indentation,
             %grid__cbx-selection {
@@ -1310,6 +1311,7 @@
         }
 
         %grid__cbx-selection,
+        %igx-grid__hierarchical-expander,
         %igx-grid__row-indentation,
         %igx-grid__drag-indicator {
             border-bottom: rem(1px) solid var-get($theme, 'row-border-color');
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.html b/src/app/grid-cellMerging/grid-cellMerging.component.html
index b522b1af332..bc53e1cb9fa 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.html
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.html
@@ -1,7 +1,7 @@
 <h4 class="sample-title">Grid with cell merge</h4>
 
 <div class="grid__wrapper">
-  <igx-input-group type="search" class="offset">
+  <igx-input-group type="search" class="searchInput">
     <igx-prefix>
       @if (searchText.length === 0) {
         <igx-icon>search</igx-icon>
@@ -45,46 +45,47 @@ <h4 class="sample-title">Grid with cell merge</h4>
 </div>
 <igx-grid [data]="data" width="800px" height="550px" [moving]="true" #grid1
     [cellMergeMode]="'always'" [rowSelection]="'single'">
-    <igx-column field="ProductID" header="Product ID" width="200px">
-        <ng-template igxCell let-cell="cell" let-val>
-            <div>
-                <button igxButton>Test {{cell.row.index}}</button>
-                <!-- @if (cell.row.index % 2 == 0) {
-                <br/>
-                <button igxButton>Test 2</button>
-            } -->
-
-            </div>
-        </ng-template>
+    <igx-column field="OrderID" header="Order ID" [hidden]="true" >
+    </igx-column>
+    <igx-column field="ShipCountry" header="Ship Country" width="200px" [merge]="true" sortable="true">
+    </igx-column>
+    <igx-column field="OrderDate" header="Order Date" width="200px" [dataType]="'date'" sortable="true">
+    </igx-column>
+    <igx-column field="PostalCode" header="Postal Code" width="200px" >
+    </igx-column>
+    <igx-column field="Discontinued" header="Discontinued" width="200px" sortable="true">
+    </igx-column>
+    <igx-column field="ShipName" header="Ship Name" width="250px">
+    </igx-column>
+    <igx-column field="ShipCity" header="Ship City" width="250px">
     </igx-column>
-    <igx-column field="ReorderLevel" width="200px" [merge]="true" editable="true">
+    <igx-column field="ShipperName" header="Shipper Name" width="250px">
     </igx-column>
-    <igx-column required field="ProductName" width="200px" [merge]="true" groupable="true">
+    <igx-column field="Salesperson" header="Salesperson" width="250px">
     </igx-column>
-    <igx-column field="UnitsInStock" header="UnitsInStock" width="200px" [merge]="true">
+    <igx-column field="UnitPrice" header="Unit Price" width="150px" dataType="number">
     </igx-column>
-    <igx-column field="OrderDate" width="200px">
+    <igx-column field="Quantity" header="Quantity" width="150px" dataType="number">
     </igx-column>
     <igx-paginator [perPage]="20">
     </igx-paginator>
-    <igx-action-strip>
+    <!-- <igx-action-strip>
         <igx-grid-pinning-actions></igx-grid-pinning-actions>
-    </igx-action-strip>
+    </igx-action-strip> -->
     <igx-grid-toolbar>
         <igx-grid-toolbar-actions>
             <igx-grid-toolbar-hiding></igx-grid-toolbar-hiding>
             <igx-grid-toolbar-pinning></igx-grid-toolbar-pinning>
-            <igx-grid-toolbar-exporter></igx-grid-toolbar-exporter>
         </igx-grid-toolbar-actions>
     </igx-grid-toolbar>
 </igx-grid>
 
 <h4 class="sample-title">Hierarchical grid with cell merge</h4>
 
-<igx-hierarchical-grid #hierarchicalGrid width="800px" [height]="'550px'" [data]="hierarchicalData" [autoGenerate]="false"
+<igx-hierarchical-grid #hierarchicalGrid width="800px" [rowSelection]="'single'" [height]="'550px'" [data]="hierarchicalData" [autoGenerate]="false"
     [allowAdvancedFiltering]="true" [cellMergeMode]="'always'">
     <igx-grid-toolbar></igx-grid-toolbar>
-    <igx-column field="EmployeeID" width="200px">
+    <igx-column field="EmployeeID" width="200px" [hidden]="true">
     </igx-column>
     <igx-column field="FirstName" width="200px">
     </igx-column>
@@ -108,7 +109,7 @@ <h4 class="sample-title">Hierarchical grid with cell merge</h4>
 
 <h4 class="sample-title">Tree grid with cell merge</h4>
 
-<igx-tree-grid [autoGenerate]="false" [data]="treeData" [cellMergeMode]="'always'" [mergeStrategy]="treeGridMergeStrategy"
+<igx-tree-grid [autoGenerate]="false" [rowSelection]="'single'" [data]="treeData" [cellMergeMode]="'always'" [mergeStrategy]="treeGridMergeStrategy"
 childDataKey="ChildCompanies" primaryKey="ID" [expansionDepth]="1" width="800px" [height]="'550px'">
 <igx-column field="ContactName" width="200px">
 </igx-column>
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.scss b/src/app/grid-cellMerging/grid-cellMerging.component.scss
index 3d4037836d0..9f4f5d20867 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.scss
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.scss
@@ -17,3 +17,6 @@
 .grid-size {
     --ig-size: var(--ig-size-small);
 }
+.searchInput{
+    width: 800px;
+}
diff --git a/src/app/grid-cellMerging/grid-cellMerging.component.ts b/src/app/grid-cellMerging/grid-cellMerging.component.ts
index 89b86f37a5e..d8cb3919a15 100644
--- a/src/app/grid-cellMerging/grid-cellMerging.component.ts
+++ b/src/app/grid-cellMerging/grid-cellMerging.component.ts
@@ -27,6 +27,7 @@ import { HIERARCHICAL_DATA } from '../shared/hierarchicalData';
 import { data, dataWithoutPK } from '../shared/data';
 import { HIERARCHICAL_SAMPLE_DATA } from '../shared/sample-data';
 import { ByLevelTreeGridMergeStrategy } from 'igniteui-angular';
+import { INVOICE_DATA } from '../shared/invoiceData';
 
 @Component({
     selector: 'app-grid-cellMerging',
@@ -36,16 +37,13 @@ import { ByLevelTreeGridMergeStrategy } from 'igniteui-angular';
         FormsModule,
         IgxColumnComponent,
         IgxGridComponent,
-        IgxCellTemplateDirective,
-        IgxButtonDirective,
         IgxPaginatorComponent,
-        IgxActionStripComponent,
-        IgxGridPinningActionsComponent,
+        // IgxActionStripComponent,
+        // IgxGridPinningActionsComponent,
         IgxGridToolbarComponent,
         IgxGridToolbarActionsComponent,
         IgxGridToolbarPinningComponent,
         IgxGridToolbarHidingComponent,
-        IgxGridToolbarExporterComponent,
         IgxHierarchicalGridComponent,
         IgxRowIslandComponent,
         IgxTreeGridComponent,
@@ -64,340 +62,7 @@ export class GridCellMergingComponent {
     public alignTop= { alignItems: "flex-start", paddingTop: "12px" };
     public searchText: string ='';
     @ViewChild('grid1', { static: true }) public grid: IgxGridComponent;
-    public data = [{
-        ProductID: 1,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '10 boxes x 20 bags',
-        UnitPrice: '18.0000',
-        UnitsInStock: 39,
-        UnitsOnOrder: 0,
-        ReorderLevel: 10.567,
-        Discontinued: false,
-        OrderDate: null,
-        OrderDate2: new Date(1991, 2, 12, 18, 40, 50).toISOString()
-    }, {
-        ProductID: 2,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 3,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 4,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '20.0000',
-        UnitsInStock: 20,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 5,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 6,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 7,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 8,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 30,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 9,
-        ProductName: 'Aniseed Syrup',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 13,
-        UnitsOnOrder: 70,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 10,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 13,
-        UnitsOnOrder: 70,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 11,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 13,
-        UnitsOnOrder: 70,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 12,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 12,
-        UnitsOnOrder: 70,
-        ReorderLevel: 30,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 13,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '10 boxes x 20 bags',
-        UnitPrice: '18.0000',
-        UnitsInStock: 39,
-        UnitsOnOrder: 0,
-        ReorderLevel: 10.567,
-        Discontinued: false,
-        OrderDate: null,
-        OrderDate2: new Date(1991, 2, 12, 18, 40, 50).toISOString()
-    }, {
-        ProductID: 14,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 15,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 16,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '20.0000',
-        UnitsInStock: 20,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 17,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 18,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 19,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 20,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 1,
-        QuantityPerUnit: '24 - 12 oz bottles',
-        UnitPrice: '19.0000',
-        UnitsInStock: 17,
-        UnitsOnOrder: 40,
-        ReorderLevel: 30,
-        Discontinued: false,
-        OrderDate: new Date('2003-03-17').toISOString(),
-        OrderDate2: new Date('2003-03-17').toISOString()
-    },
-    {
-        ProductID: 21,
-        ProductName: 'Aniseed Syrup',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 13,
-        UnitsOnOrder: 70,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 22,
-        ProductName: 'Chang',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 13,
-        UnitsOnOrder: 70,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 23,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 13,
-        UnitsOnOrder: 70,
-        ReorderLevel: 25,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    },
-    {
-        ProductID: 24,
-        ProductName: 'Chai',
-        SupplierID: 1,
-        CategoryID: 2,
-        QuantityPerUnit: '12 - 550 ml bottles',
-        UnitPrice: '10.0000',
-        UnitsInStock: 12,
-        UnitsOnOrder: 70,
-        ReorderLevel: 30,
-        Discontinued: false,
-        OrderDate: new Date('2006-03-17').toISOString(),
-        OrderDate2: new Date(1991, 2, 12, 15, 40, 50).toISOString()
-    }];
+    public data = INVOICE_DATA;
 
     public searchKeyDown(ev) {
         if (ev.key === 'Enter' || ev.key === 'ArrowDown' || ev.key === 'ArrowRight') {
diff --git a/src/app/shared/invoiceData.ts b/src/app/shared/invoiceData.ts
new file mode 100644
index 00000000000..051444c0009
--- /dev/null
+++ b/src/app/shared/invoiceData.ts
@@ -0,0 +1,8081 @@
+/* eslint-disable */
+
+export interface Invoice {
+    ID: number;
+    ShipAddress: string;
+    ShipCity: string;
+    ShipCountry: string;
+    ShipName: string;
+    ShipRegion: string;
+    ShipPostalCode: string;
+    CustomerID: string;
+    CustomerName: string;
+    Address: string;
+    City: string;
+    Region: string;
+    PostalCode: string;
+    Country: string;
+    Salesperson: string;
+    OrderID: number;
+    OrderDate: Date;
+    ShipperName: string;
+    ProductID: number;
+    ProductName: string;
+    UnitPrice: number;
+    Quantity: number;
+    Discontinued: boolean;
+    ExtendedPrice: number;
+    Freight: number;
+}
+
+export const INVOICE_DATA = [{
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipCountry: "Germany",
+    ShipName: "Alfred's Futterkiste",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10692,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "United Package",
+    ProductID: 63,
+    ProductName: "Vegie-spread",
+    UnitPrice: 43.9000,
+    Quantity: 20,
+    Discontinued: false,
+    ExtendedPrice: 878.0000,
+    Freight: 61.0200
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10702,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 3,
+    ProductName: "Aniseed Syrup",
+    UnitPrice: 10.0000,
+    Quantity: 6,
+    Discontinued: false,
+    ExtendedPrice: 60.0000,
+    Freight: 23.9400
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10702,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 76,
+    ProductName: "Lakkalik\u00f6\u00f6ri",
+    UnitPrice: 18.0000,
+    Quantity: 15,
+    Discontinued: false,
+    ExtendedPrice: 270.0000,
+    Freight: 23.9400
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Nancy Davolio",
+    OrderID: 10835,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 59,
+    ProductName: "Raclette Courdavault",
+    UnitPrice: 55.0000,
+    Quantity: 15,
+    Discontinued: false,
+    ExtendedPrice: 825.0000,
+    Freight: 69.5300
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Nancy Davolio",
+    OrderID: 10952,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 28,
+    ProductName: "R\u00f6ssle Sauerkraut",
+    UnitPrice: 45.6000,
+    Quantity: 2,
+    Discontinued:  true,
+    ExtendedPrice: 91.2000,
+    Freight: 40.4200
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Janet Leverling",
+    OrderID: 11011,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 71,
+    ProductName: "Flotemysost",
+    UnitPrice: 21.5000,
+    Quantity: 20,
+    Discontinued:  true,
+    ExtendedPrice: 430.0000,
+    Freight: 1.2100
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Nancy Davolio",
+    OrderID: 10952,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 6,
+    ProductName: "Grandma's Boysenberry Spread",
+    UnitPrice: 25.0000,
+    Quantity: 16,
+    Discontinued: true,
+    ExtendedPrice: 380.0000,
+    Freight: 40.4200
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Janet Leverling",
+    OrderID: 11011,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 58,
+    ProductName: "Escargots de Bourgogne",
+    UnitPrice: 13.2500,
+    Quantity: 40,
+    Discontinued: true,
+    ExtendedPrice: 503.5000,
+    Freight: 1.2100
+}, {
+    ShipName: "Alfred's Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Nancy Davolio",
+    OrderID: 10835,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 77,
+    ProductName: "Original Frankfurter gr\u00fcne So\u00dfe",
+    UnitPrice: 13.0000,
+    Quantity: 2,
+    Discontinued:  true,
+    ExtendedPrice: 20.8000,
+    Freight: 69.5300
+}, {
+    ShipName: "Alfreds Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Michael Suyama",
+    OrderID: 10643,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 28,
+    ProductName: "R\u00f6ssle Sauerkraut",
+    UnitPrice: 45.6000,
+    Quantity: 15,
+    Discontinued:  true,
+    ExtendedPrice: 513.0000,
+    Freight: 29.4600
+}, {
+    ShipName: "Alfreds Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Michael Suyama",
+    OrderID: 10643,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 39,
+    ProductName: "Chartreuse verte",
+    UnitPrice: 18.0000,
+    Quantity: 21,
+    Discontinued:  true,
+    ExtendedPrice: 283.5000,
+    Freight: 29.4600
+}, {
+    ShipName: "Alfreds Futterkiste",
+    ShipAddress: "Obere Str. 57",
+    ShipCity: "Berlin",
+    ShipRegion: null,
+    ShipPostalCode: "12209",
+    ShipCountry: "Germany",
+    CustomerID: "ALFKI",
+    CustomerName: "Alfreds Futterkiste",
+    Address: "Obere Str. 57",
+    City: "Berlin",
+    Region: null,
+    PostalCode: "12209",
+    Country: "Germany",
+    Salesperson: "Michael Suyama",
+    OrderID: 10643,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 46,
+    ProductName: "Spegesild",
+    UnitPrice: 12.0000,
+    Quantity: 2,
+    Discontinued: true,
+    ExtendedPrice: 18.0000,
+    Freight: 29.4600
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Robert King",
+    OrderID: 10308,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 69,
+    ProductName: "Gudbrandsdalsost",
+    UnitPrice: 28.8000,
+    Quantity: 1,
+    Discontinued: false,
+    ExtendedPrice: 28.8000,
+    Freight: 1.6100
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Robert King",
+    OrderID: 10308,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 70,
+    ProductName: "Outback Lager",
+    UnitPrice: 12.0000,
+    Quantity: 5,
+    Discontinued: false,
+    ExtendedPrice: 60.0000,
+    Freight: 1.6100
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Janet Leverling",
+    OrderID: 10625,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 14,
+    ProductName: "Tofu",
+    UnitPrice: 23.2500,
+    Quantity: 3,
+    Discontinued: false,
+    ExtendedPrice: 69.7500,
+    Freight: 43.9000
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Janet Leverling",
+    OrderID: 10625,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 42,
+    ProductName: "Singaporean Hokkien Fried Mee",
+    UnitPrice: 14.0000,
+    Quantity: 5,
+    Discontinued: false,
+    ExtendedPrice: 70.0000,
+    Freight: 43.9000
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Janet Leverling",
+    OrderID: 10625,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Speedy Express",
+    ProductID: 60,
+    ProductName: "Camembert Pierrot",
+    UnitPrice: 34.0000,
+    Quantity: 10,
+    Discontinued: false,
+    ExtendedPrice: 340.0000,
+    Freight: 43.9000
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Janet Leverling",
+    OrderID: 10759,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 32,
+    ProductName: "Mascarpone Fabioli",
+    UnitPrice: 32.0000,
+    Quantity: 10,
+    Discontinued: false,
+    ExtendedPrice: 320.0000,
+    Freight: 11.9900
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10926,
+    OrderDate: new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 11,
+    ProductName: "Queso Cabrales",
+    UnitPrice: 21.0000,
+    Quantity: 2,
+    Discontinued: false,
+    ExtendedPrice: 42.0000,
+    Freight: 39.9200
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10926,
+    OrderDate: new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 13,
+    ProductName: "Konbu",
+    UnitPrice: 6.0000,
+    Quantity: 10,
+    Discontinued: false,
+    ExtendedPrice: 60.0000,
+    Freight: 39.9200
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10926,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 19,
+    ProductName: "Teatime Chocolate Biscuits",
+    UnitPrice: 9.2000,
+    Quantity: 7,
+    Discontinued: false,
+    ExtendedPrice: 64.4000,
+    Freight: 39.9200
+}, {
+    ShipName: "Ana Trujillo Emparedados y helados",
+    ShipAddress: "Avda. de la Constituci\u00f3n 2222",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05021",
+    ShipCountry: "Mexico",
+    CustomerID: "ANATR",
+    CustomerName: "Ana Trujillo Emparedados y helados",
+    Address: "Avda. de la Constituci\u00f3n 2222",
+    City: "M\u00e9xico D.F.",
+    Region: null,
+    PostalCode: "05021",
+    Country: "Mexico",
+    Salesperson: "Margaret Peacock",
+    OrderID: 10926,
+    OrderDate:  new Date("11/23/2016"),
+    ShipperName: "Federal Shipping",
+    ProductID: 72,
+    ProductName: "Mozzarella di Giovanni",
+    UnitPrice: 34.8000,
+    Quantity: 10,
+    Discontinued: false,
+    ExtendedPrice: 348.0000,
+    Freight: 39.9200
+}, {
+    ShipName: "Antonio Moreno Taquer\u00eda",
+    ShipAddress: "Mataderos  2312",
+    ShipCity: "M\u00e9xico D.F.",
+    ShipRegion: null,
+    ShipPostalCode: "05023",
+    ShipCountry: "Mexico",
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+    UnitPrice: 34.0000,
+    Quantity: 50,
+    Discontinued: false,
+    ExtendedPrice: 1700.0000,
+    Freight: 278.9600
+}, {
+    ShipName: "Eastern Connection",
+    ShipAddress: "35 King George",
+    ShipCity: "London",
+    ShipRegion: null,
+    ShipPostalCode: "WX3 6FW",
+    ShipCountry: "UK",
+    CustomerID: "EASTC",
+    CustomerName: "Eastern Connection",
+    Address: "35 King George",
+    City: "London",
+    Region: null,
+    PostalCode: "WX3 6FW",
+    Country: "UK",
+    Salesperson: "Robert King",
+    OrderID: 11047,
+    OrderDate: new Date("4/24/2017"),
+    ShipperName: "Federal Shipping",
+    ProductID: 1,
+    ProductName: "Chai",
+    UnitPrice: 18.0000,
+    Quantity: 25,
+    Discontinued: true,
+    ExtendedPrice: 337.5000,
+    Freight: 46.6200
+}];
+/* tslint:enable */