Ticket #42321: 42321.3.patch

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

@@ -829 +829 @@
                                         }
                                 }
                         });
+
+                        $( '#menu-name' ).on('keyup', _.debounce( function (e) {
+                                var menuName = $( document.getElementById( 'menu-name' ) ),
+                                        menuNameVal = menuName.val();
+
+                                if ( ! menuNameVal || menuNameVal === menuName.attr( 'title' ) || ! menuNameVal.replace( /\s+/, '' ) ) {
+                                        // Add warning for invalid menu name
+                                        menuName.parent().addClass( 'form-invalid' );
+                                } else {
+                                        // Remove warning for valid menu name
+                                        menuName.parent().removeClass( 'form-invalid' );
+                                }
+                        }, 500 ));
+
                         $('#add-custom-links input[type="text"]').keypress(function(e){
                                 $('#customlinkdiv').removeClass('form-invalid');
 

src/wp-includes/script-loader.php

@@ -877 +877 @@
                 ) );
 
                 // Navigation Menus
-                $scripts->add( 'nav-menu', "/wp-admin/js/nav-menu$suffix.js", array( 'jquery-ui-sortable', 'jquery-ui-draggable', 'jquery-ui-droppable', 'wp-lists', 'postbox', 'json2' ) );
+                $scripts->add( 'nav-menu', "/wp-admin/js/nav-menu$suffix.js", array( 'jquery-ui-sortable', 'jquery-ui-draggable', 'jquery-ui-droppable', 'wp-lists', 'postbox', 'json2', 'underscore' ) );
                 did_action( 'init' ) && $scripts->localize( 'nav-menu', 'navMenuL10n', array(
                         'noResultsFound' => __( 'No results found.' ),
                         'warnDeleteMenu' => __( "You are about to permanently delete this menu. \n 'Cancel' to stop, 'OK' to delete." ),