RouteDetailMenuLink.php

<?php

namespace Drupal\devel\Plugin\Menu;

use Drupal\Core\Menu\MenuLinkDefault;
use Drupal\Core\Url;

/**
 * Modifies the menu link to add current route path.
 */
class RouteDetailMenuLink extends MenuLinkDefault {
  
  /**
   * {@inheritdoc}
   */
  public function getOptions() {
    $options = parent::getOptions();
    $options['query']['path'] = '/' . Url::fromRoute('<current>')->getInternalPath();
    return $options;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCacheMaxAge() {
    return 0;
  }

}