Index: src/wp-admin/css/admin-menu.css
===================================================================
--- src/wp-admin/css/admin-menu.css	(revision 32705)
+++ src/wp-admin/css/admin-menu.css	(working copy)
@@ -446,7 +446,9 @@
 	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;
 }
 
Index: src/wp-admin/css/colors/_admin.scss
===================================================================
--- src/wp-admin/css/colors/_admin.scss	(revision 32705)
+++ src/wp-admin/css/colors/_admin.scss	(working copy)
@@ -161,7 +161,8 @@
 #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;
 }