ZP-723 Overwrite windowsSize only if it's bigger than the available

global windowSize.

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

src/lib/request/sync.php

@@ -909,7 +909,7 @@ class Sync extends RequestProcessor {
 
                             // limit windowSize to the max available limit of the global window size left
                             $globallyAvailable = $sc->GetGlobalWindowSize() - $globallyExportedItems;
-                            if ($changecount > $globallyAvailable) {
+                            if ($changecount > $globallyAvailable && $windowSize > $globallyAvailable) {
                                 ZLog::Write(LOGLEVEL_DEBUG, sprintf("HandleSync(): Limit window size to %d as the global window size limit will be reached", $globallyAvailable));
                                 $windowSize = $globallyAvailable;
                             }