cforge-2.0.x-dev/src/MenuParentFormSelector.php

<?php

namespace Drupal\cforge;

/**
 * Prevent the menu parent popup from showing anything but the menu names.
 */
class MenuParentFormSelector extends \Drupal\Core\Menu\MenuParentFormSelector {

  protected function getParentDepthLimit($id) {
    if (self::flatMenus()) {
      return 0;
    }
    return parent::getParentDepthLimit($id);
  }

  static function flatMenus() {
    $themes = \Drupal::config('core.extension')->get('theme');
    return isset($themes['sky_seldulac']);
  }
}