fix #13677 FontStyle.Bold Not Visually Applied to LinkLabel at Runtime via Code

Epica3055 · LeafShi1 · commit 2e7e90014d73 · 2025-07-15T18:18:50.000-07:00
diff --git a/src/System.Windows.Forms/src/System/Windows/Forms/LinkUtilities.cs b/src/System.Windows.Forms/src/System/Windows/Forms/LinkUtilities.cs
@@ -162,7 +162,7 @@ public static void EnsureLinkFonts(
         LinkBehavior link,
         [AllowNull] ref Font linkFont,
         [AllowNull] ref Font hoverLinkFont,
-        bool isActive = false)
+        bool? isActive = null)
     {
         if (linkFont is not null && hoverLinkFont is not null)
         {
@@ -209,11 +209,11 @@ public static void EnsureLinkFonts(
                 style &= ~FontStyle.Underline;
             }
 
-            if (isActive)
+            if (isActive is not null and true)
             {
                 style |= FontStyle.Bold;
             }
-            else
+            else if (isActive is not null and false)
             {
                 style &= ~FontStyle.Bold;
             }

Original file line number	Diff line number	Diff line change
`@@ -162,7 +162,7 @@ public static void EnsureLinkFonts(`
`162`	`162`	`LinkBehavior link,`
`163`	`163`	`[AllowNull] ref Font linkFont,`
`164`	`164`	`[AllowNull] ref Font hoverLinkFont,`
`165`		`- bool isActive = false)`
	`165`	`+ bool? isActive = null)`
`166`	`166`	`{`
`167`	`167`	`if (linkFont is not null && hoverLinkFont is not null)`
`168`	`168`	`{`
`@@ -209,11 +209,11 @@ public static void EnsureLinkFonts(`
`209`	`209`	`style &= ~FontStyle.Underline;`
`210`	`210`	`}`
`211`	`211`
`212`		`- if (isActive)`
	`212`	`+ if (isActive is not null and true)`
`213`	`213`	`{`
`214`	`214`	`style \|= FontStyle.Bold;`
`215`	`215`	`}`
`216`		`- else`
	`216`	`+ else if (isActive is not null and false)`
`217`	`217`	`{`
`218`	`218`	`style &= ~FontStyle.Bold;`
`219`	`219`	`}`