ZP-895 Check in contentData if the generated folderid already exists

instead of checking for it in cache.

Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/core/asdevice.php

@@ -966,7 +966,7 @@ class ASDevice extends StateObject {
         $cnt = 0;
         // Collision avoiding. Append an increasing number to the string to hash
         // until there aren't any collisions. Probably a smaller number is also sufficient.
-        while (in_array($folderId, $this->backend2folderidCache) && $cnt < 10000) {
+        while (isset($this->contentData[$folderId]) && $cnt < 10000) {
             $folderId = substr($folderOrigin . dechex(crc32($backendid . $folderName . $cnt++)), 0, 6);
             ZLog::Write(LOGLEVEL_WARN, sprintf("ASDevice->generateFolderHash(): collision avoiding nr %05d. Generated hash: '%s'", $cnt, $folderId));
         }