Ticket #56577: 56577.diff

src/wp-includes/nav-menu.php

@@ -815 +815 @@
  * @return object The menu item with standard menu item properties.
  */
 function wp_setup_nav_menu_item( $menu_item ) {
+
+        /**
+         * Filters whether to short-circuit the wp_setup_nav_menu_item() output.
+         *
+         * Returning a non-null value from the filter will short-circuit wp_setup_nav_menu_item(),
+         * returning that value.
+         *
+         * @param object|null $modified_menu_item Modified menu item. Default null.
+         * @param object      $menu_item The menu item to modify.
+         */
+        $pre_menu_item = apply_filters( 'pre_wp_setup_nav_menu_item', null, $menu_item );
+
+        if ( null !== $pre_menu_item ) {
+                return $pre_menu_item;
+        }       
+
         if ( isset( $menu_item->post_type ) ) {
                 if ( 'nav_menu_item' === $menu_item->post_type ) {
                         $menu_item->db_id            = (int) $menu_item->ID;