Merge branch 'master' into set-ref-widget

Author: martinRenou

.github/workflows/build.yml

@@ -43,7 +43,7 @@ jobs:
         pip uninstall -y "sidecar" jupyterlab
 
     - name: Upload extension packages
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: extension-artifacts
         path: dist/sidecar*
@@ -59,7 +59,7 @@ jobs:
       with:
         python-version: '3.9'
         architecture: 'x64'
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
         name: extension-artifacts
     - name: Install and Test

README.md

@@ -45,7 +45,6 @@ is used instead.
 
 ![sidecar in right panel (default)](sidecar.gif)
 
-
 ### Opening a sidecar in the main work area
 
 By default, a sidecar will be displayed on the right panel, which has some limitations:
@@ -58,7 +57,6 @@ new JupyterLab window which can be re-arranged as desired.
 
 ![sidecar in main work area](sidecar-main-area.gif)
 
-
 ### Arrange a new sidecar with respect to another sidecar
 
 The `anchor` parameter sets the position of the new sidecar relative to the 
@@ -70,7 +68,6 @@ For example:
 
 ![sidecar arranged with respect to another sidecar](sidecar-ref-anchor.png)
 
-
 ## Development
 
 ```bash