fix clipping compact menubar

src/vs/workbench/browser/parts/activitybar/media/activitybarpart.css

@@ -19,6 +19,7 @@
 	 * macOS: does not render LCD-anti-aliased.
 	 */
 	transform: translate3d(0px, 0px, 0px);
+	overflow: visible; /* when a new layer is created, we need to set overflow visible to avoid clipping the menubar */
 }
 
 .monaco-workbench .activitybar > .content {