FilePreviewTable::onDelete

static function onDelete(Event $event)
{
	$id = $event->getParameter('primary')['ID'];
	if (isset(self::$alreadyDeleted[$id]))
	{
		return;
	}

	$file = self::getRowById($id);
	if (!$file)
	{
		return;
	}

	self::deleteContent($file);
}