Ticket #32579: 32579.diff

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

@@ -446 +446 @@
         margin-top: -8px;
 }
 
-.folded ul#adminmenu li:hover a.wp-has-current-submenu:after {
+.folded ul#adminmenu li:hover a.wp-has-current-submenu:after,
+.folded ul#adminmenu a.wp-has-current-submenu:focus:after,
+.folded ul#adminmenu .opensub a.wp-has-current-submenu:after {
         display: none;
 }
 

src/wp-admin/css/colors/_admin.scss

@@ -161 +161 @@
 #adminmenu .wp-has-current-submenu .wp-submenu,
 #adminmenu .wp-has-current-submenu.opensub .wp-submenu,
 .folded #adminmenu .wp-has-current-submenu .wp-submenu,
-#adminmenu a.wp-has-current-submenu:focus + .wp-submenu {
+#adminmenu a.wp-has-current-submenu:focus + .wp-submenu,
+.folded #adminmenu a.wp-has-current-submenu:focus + .wp-submenu {
         background: $menu-submenu-background;
 }