Ticket #52148: admin-menu.css.patch

src/wp-admin/css/admin-menu.css

@@ -451 +451 @@
 /* flyout menu arrow */
 #adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after {
         right: 0;
-        border: solid transparent;
+        border: 8px solid transparent;
         content: " ";
         height: 0;
         width: 0;
         position: absolute;
         pointer-events: none;
-        border-width: 8px;
         top: 10px;
         z-index: 10000;
 }