Ticket #18556: 18556.6.diff

src/js/_enqueues/admin/common.js

@@ -843 +843 @@
                 $(e.target).parent().siblings('a').get(0).click();
         });
 
+        // Disables popup menus on the admin toolbar and admin menu while dragging.
+        var draggables = '.widget, .widgets-sortables, .meta-box-sortables, .menu';
+        var popups     = '#wpadminbar .menupop .ab-submenu, #adminmenu .wp-not-current-submenu .wp-submenu, .folded #adminmenu .wp-has-current-submenu .wp-submenu';
+        $( draggables ).on( 'sortstart dragstart sortstop dragstop', function() {
+                $( popups ).toggleClass( 'hidden' );
+        });
+
         /**
          * Collapses the admin menu.
          *

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

@@ -343 +343 @@
         box-shadow: none;
 }
 
+#wpadminbar .quicklinks .menupop ul.ab-sub-secondary.hidden {
+        display: none;
+}
+
 #wpadminbar .quicklinks .menupop ul.ab-sub-secondary,
 #wpadminbar .quicklinks .menupop ul.ab-sub-secondary .ab-submenu {
         background: #3c434a;