<?php if (!defined('ABSPATH')) {
  die;
}
/**
 *
 * Custom Walker for Nav Menu Edit
 *
 * @since 1.0.0
 * @version 1.0.0
 *
 */
if (!class_exists('CSF_Walker_Nav_Menu_Edit') && class_exists('Walker_Nav_Menu_Edit')) {
  class CSF_Walker_Nav_Menu_Edit extends Walker_Nav_Menu_Edit
  {

    public function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0)
    {

      $html = '';

      parent::start_el($html, $item, $depth, $args, $id);

      ob_start();
      do_action('wp_nav_menu_item_custom_fields', $item->ID, $item, $depth, $args);
      $custom_fields = ob_get_clean();

      $output .= preg_replace('/(?=<(fieldset|p)[^>]+class="[^"]*field-move)/', $custom_fields, $html);
    }
  }
}