Merge pull request #404 in ZP/z-push from...

Merge pull request #404 in ZP/z-push from bugfix/ZP-1087-short-folderid-hash-collisions-on to develop

* commit '844e925b':
  ZP-1087 Also check backend2folderidCache for generated but not (yet) synchronized short folderids when hashing.

src/lib/core/asdevice.php

@@ -1057,7 +1057,7 @@ class ASDevice extends StateObject {
         $cnt = 0;
         // Collision avoiding. Append an increasing number to the string to hash
         // until there aren't any collisions. Probably a smaller number is also sufficient.
-        while (isset($this->contentData[$folderId]) && $cnt < 10000) {
+        while ((isset($this->contentData[$folderId]) || in_array($folderId, $this->backend2folderidCache, true)) && $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));
         }