Ticket #13147: 13147.1.patch

wp-admin/js/nav-menu.dev.js

@@ -160 +160 @@
                         setupListItemsDragAndDrop.call(this, menuList); 
 
                         postboxes.add_postbox_toggles('nav-menus');
+                        postboxes.pbshow = function(id){ $('#'+id+" .inside").slideDown('fast'); };
+                        postboxes.pbhide = function(id){ $('#'+id+" .inside").slideUp('fast'); };
+                        $("#menu-settings-column .postbox").not(".closed").children(".inside").show();
                 },
                 
                 attachMenuEditListeners : function() {

wp-admin/css/nav-menu.dev.css

@@ -21 +21 @@
 #menu-settings-column .inside {
         padding:0 10px;
 }
+        .js #menu-settings-column .inside {
+                display: none;
+        }
 
 #menu-settings-column .handlediv {
         background: url("../images/menu-bits.gif") no-repeat scroll 0 -110px;