Change rtrim to preg_replace

lib/file-control-xhr.php

@@ -48,7 +48,7 @@ if (!$error) {
 	$file = rtrim(rtrim($file,'+'),' ');
 
 	// Also remove [NEW] from $file, we can consider $_GET['action'] or $fileOrig to pick that up
-	$file = rtrim($file,'[NEW]');
+	$file = preg_replace('/\[NEW\]$/', '', $file);
 
 	// Make each path in $file a full path (; seperated list)
 	$allFiles = explode(";",$file);