Version: 3.2.3

Bug Description

When errors added to a form or a control are instances of Nette\HtmlStringable they cummulate.

Steps To Reproduce

 $form = new UI\Form; $form->addError(Nette\Utils\Html::fromHtml('1')); $form->addError(Nette\Utils\Html::fromHtml('2')); $renderer = $form->getRenderer(); assert($renderer instanceof \Nette\Forms\Rendering\DefaultFormRenderer); print $renderer->render($form);

renders the second error twice:

<form action="" method="post"> <ul class="error"> <li>	1 </li> <li>	1	2 </li> </ul> </form>

Possible Solution

It seems to be the problem of clonning and addHtml() in DefaultFormRenderer/doRenderErrors().