ActionMenuItemGroupViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Be\Menus;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 3
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode;

class ActionMenuItemGroupViewHelper extends ActionMenuViewHelper
{
    protected $tagName = 'optgroup';

    public function render($label = '')
    {
        $this->tag->addAttribute('label', $label);
        $options = '';
        foreach ($this->childNodes as $childNode) {
            if ($childNode instanceof ViewHelperNode && $childNode->getViewHelperClassName() === ActionMenuItemViewHelper::class) {
                $options .= $childNode->evaluate($this->renderingContext);
            }
        }
        $this->tag->setContent($options);
        return $this->tag->render();
    }
}