about: dialog does not display correctly when re-opened

Fixes: #7129
The help dialog was not rendering the list of extensions, hence functionality was added to display the list even after it being closed once.

Signed-off-by: Muhammad Anas Shahid <muhammad.shahid@ericsson.com>

packages/core/src/browser/dialogs/react-dialog.tsx

@@ -39,6 +39,16 @@ export abstract class ReactDialog<T> extends AbstractDialog<T> {
         ReactDOM.render(<>{this.render()}</>, this.contentNode, () => this.onRender.dispose());
     }
 
+    protected onAfterAttach(msg: Message): void {
+        super.onAfterAttach(msg);
+        this.update();
+    }
+
+    protected onActivateRequest(msg: Message): void {
+        super.onActivateRequest(msg);
+        this.update();
+    }
+
     /**
      * Render the React widget in the DOM.
      * - If the widget has been previously rendered,