Ticket #18556: 18556.5.diff

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

@@ -281 +281 @@
         width: auto;
 }
 
+#adminmenu.disable-popup .wp-submenu {
+        display: none;
+}
+
 #adminmenu .wp-submenu a {
         font-size: 13px;
         line-height: 1.2;

src/wp-admin/js/common.js

@@ -210 +210 @@
                 $(e.target).parent().siblings('a').get(0).click();
         });
 
+        // Disable popup menus on the admin toolbar and admin menu while dragging.
+        var draggables = '.widget, .widgets-sortables, .meta-box-sortables, .menu';
+        $( draggables ).on( 'sortstart dragstart sortstop dragstop', function() {
+                $toolbar.toggleClass('disable-popup');
+                $adminmenu.toggleClass('disable-popup');
+        });
+
         $('#collapse-menu').on('click.collapse-menu', function() {
                 var respWidth, state;
 

src/wp-includes/css/admin-bar.css

@@ -173 +173 @@
         padding: 6px 0;
 }
 
+#wpadminbar #wp-toolbar.disable-popup .ab-submenu {
+        display: none;
+}
+
 #wpadminbar .selected .shortlink-input {
         display: block;
 }