MenuSettingsConstraint.php

<?php

namespace Drupal\menu_ui\Plugin\Validation\Constraint;

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Symfony\Component\Validator\Constraint as SymfonyConstraint;

/**
 * Validation constraint for changing the menu settings in pending revisions.
 */
class MenuSettingsConstraint extends SymfonyConstraint {
    public $message = 'You can only change the menu settings for the <em>published</em> version of this content.';
    public $messageWeight = 'You can only change the menu link weight for the <em>published</em> version of this content.';
    public $messageParent = 'You can only change the parent menu link for the <em>published</em> version of this content.';
    public $messageRemove = 'You can only remove the menu link in the <em>published</em> version of this content.';

}