DestinationMenuLink.php

<?php

namespace Drupal\devel\Plugin\Menu;

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

/**
 * Modifies the menu link to add destination.
 */
class DestinationMenuLink extends MenuLinkDefault {
    
    /**
     * {@inheritdoc}
     */
    public function getOptions() {
        $options = parent::getOptions();
        // Append the current path as destination to the query string.
        $options['query']['destination'] = Url::fromRoute('<current>')->toString();
        return $options;
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo Make cacheable once https://www.drupal.org/node/2582797 lands.
     */
    public function getCacheMaxAge() : int {
        return 0;
    }

}