Merge pull request #167 in ZP/z-push from...

Merge pull request #167 in ZP/z-push from bugfix/ZP-848-folderstat-should-not-be-considered to develop

* commit '7cc6292a':
  ZP-848 SetSyncKey in SPO always if it is set (as before), but invalidate FolderStat if it does not change.

src/lib/request/sync.php

@@ -164,9 +164,11 @@ class Sync extends RequestProcessor {
                             $spa->RemoveSyncKey();
                             $spa->DelFolderStat();
                         }
-                        else if ($synckey !== false && $synckey !== $spa->GetSyncKey()) {
-                            ZLog::Write(LOGLEVEL_DEBUG, "HandleSync(): Synckey does not match latest saved for this folder, removing folderstat to force Exporter setup");
-                            $spa->DelFolderStat();
+                        else if ($synckey !== false) {
+                            if ($synckey !== $spa->GetSyncKey()) {
+                                ZLog::Write(LOGLEVEL_DEBUG, "HandleSync(): Synckey does not match latest saved for this folder, removing folderstat to force Exporter setup");
+                                $spa->DelFolderStat();
+                            }
                             $spa->SetSyncKey($synckey);
                         }
                     }