fix #102518.

src/vs/workbench/contrib/notebook/browser/contrib/coreActions.ts

@@ -510,7 +510,7 @@ abstract class InsertCellCommand extends NotebookAction {
 	}
 
 	async runWithContext(accessor: ServicesAccessor, context: INotebookActionContext): Promise<void> {
-		const newCell = context.notebookEditor.insertNotebookCell(context.cell, this.kind, this.direction, undefined, context.ui);
+		const newCell = context.notebookEditor.insertNotebookCell(context.cell, this.kind, this.direction, undefined, true);
 		if (newCell) {
 			context.notebookEditor.focusNotebookCell(newCell, 'editor');
 		}