View file upload/library/XenForo/ViewPublic/Conversation/EditMessage.php

<?php

class XenForo_ViewPublic_Conversation_EditMessage extends XenForo_ViewPublic_Base
{
	public function renderHtml()
	{
		$this->_params['editorTemplate'] = XenForo_ViewPublic_Helper_Editor::getEditorTemplate(
			$this, 'message',
			$this->_params['conversationMessage']['message'],
			array(
				'extraClass' => 'NoAutoComplete'
			)
		);
	}
}