Ticket #43333: 43333.diff

src/wp-admin/js/customize-nav-menus.js

@@ -727 +727 @@
                         $( 'body' ).removeClass( 'adding-menu-items' );
                         $( '#available-menu-items .menu-item-handle.item-added' ).removeClass( 'item-added' );
 
-                        this.$search.val( '' );
+                        this.$search.val( '' ).trigger( 'keyup' );
                 },
 
                 // Add a few keyboard enhancements to the panel.