Fixes #7223 Add "-" as allowed characters in filenames

extension/qfq/qfq/helper/Sanitize.php

@@ -171,7 +171,7 @@ class Sanitize {
     public static function safeFilename($filename, $flagBaseName = false, $allowSlash = false) {
 
         // Disallow 'none alphanumeric'. Allow dot or underscore and conditionally '/'.
-        $pattern = ($allowSlash) ? '([^[:alnum:]._/])' : '([^[:alnum:]._])';
+        $pattern = ($allowSlash) ? '([^[:alnum:]._\-/])' : '([^[:alnum:]._\-])';
 
         $search = array(
             // Definition of German Umlauts START