ZP-968 Partially undo changes of commit

aeab7567. This prevents access to the
volatile state to check if the state was already used.

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

src/lib/core/synccollections.php

@@ -679,13 +679,6 @@ class SyncCollections implements Iterator {
             return false;
         }
 
-        // prevent ZP-623 by checking if the states have been used before, if so force a sync on this folder
-        if (ZPush::GetDeviceManager()->CheckHearbeatStateIntegrity($spa->GetFolderId(), $spa->GetUuid(), $spa->GetUuidCounter())) {
-            ZLog::Write(LOGLEVEL_DEBUG, "SyncCollections->CountChange(): Cannot verify changes for state as it was already used. Forcing sync of folder.");
-            $this->changes[$folderid] = 1;
-            return true;
-        }
-
         $backendFolderId = ZPush::GetDeviceManager()->GetBackendIdForFolderId($folderid);
         // switch user store if this is a additional folder (additional true -> do not debug)
         ZPush::GetBackend()->Setup(ZPush::GetAdditionalSyncFolderStore($backendFolderId, true));