PDFM-86032 QTBUG-65504 No autorelease pool block for event loop iteration

--- a/qtbase/src/plugins/platforms/cocoa/qcocoaeventdispatcher.mm
+++ b/qtbase/src/plugins/platforms/cocoa/qcocoaeventdispatcher.mm
@@ -121,6 +121,7 @@ static Boolean runLoopSourceEqualCallback(const void *info1, const void *info2)
 void QCocoaEventDispatcherPrivate::activateTimersSourceCallback(void *info)
 {
     QCocoaEventDispatcherPrivate *d = static_cast<QCocoaEventDispatcherPrivate *>(info);
+    QMacAutoReleasePool pool;
     (void) d->timerInfoList.activateTimers();
     d->maybeStartCFRunLoopTimer();
     d->maybeCancelWaitForMoreEvents();
@@ -921,6 +922,7 @@ void qt_mac_maybeCancelWaitForMoreEventsForwarder(QAbstractEventDispatcher *even
 {
     Q_UNUSED(ref);
     Q_UNUSED(activity);
+    QMacAutoReleasePool pool;
     static_cast<QCocoaEventDispatcherPrivate *>(info)->processPostedEvents();
 }
 
@@ -932,6 +934,7 @@ void qt_mac_maybeCancelWaitForMoreEventsForwarder(QAbstractEventDispatcher *even
         d->maybeCancelWaitForMoreEvents();
         return;
     }
+    QMacAutoReleasePool pool;
     d->processPostedEvents();
     d->maybeCancelWaitForMoreEvents();
 }