ContainerElementView.php

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<?php
namespace TYPO3\CMS\Form\View\Mail\Plain\Element;

class ContainerElementView extends \TYPO3\CMS\Form\View\Mail\Plain\Element\AbstractElementView {

    protected function renderChildren(array $children, $spaces = 0) {
        $content = '';
        foreach ($children as $child) {
            $content .= $this->renderChild($child, $spaces);
        }
        return $content;
    }

    protected function renderChild(\TYPO3\CMS\Form\Domain\Model\Element\AbstractElement $modelChild, $spaces) {
        $content = '';
        $class = \TYPO3\CMS\Form\Utility\FormUtility::getInstance()->getLastPartOfClassName($modelChild);
        $className = 'TYPO3\\CMS\\Form\\View\\Mail\\Plain\\Element\\' . ucfirst($class) . 'ElementView';
        if (class_exists($className)) {
            $childElement = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($className, $modelChild, $spaces);
            $elementContent = $childElement->render();
            if ($elementContent != '') {
                $content = $childElement->render() . chr(10);
            }
        }
        return $content;
    }

}