public static function prepare_delete($args, $prefix = '')
{
$path = $args['path'];
if (substr($path, 0, 1) === '/') {
$path = substr($path, 1);
}
$view = new \OC\Files\View('/' . \OC_User::getUser() . '/' . $prefix);
$info = $view->getFileInfo($path);
\OC\Preview::$deleteFileMapper = array_merge(\OC\Preview::$deleteFileMapper, array(Files\Filesystem::normalizePath($view->getAbsolutePath($path)) => $info));
}