QStateMachine: fix ignore high-priority events.

When a high-priority event is posted in overrided
'QStateMachine::beginSelectTransitions', the event may be remained in
event queue, and be not dispatched until another event posted.

Change-Id: Ifda288d9c00ac7985e426b9cc02bda382ebaac35
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/src/corelib/statemachine/qstatemachine.cpp b/src/corelib/statemachine/qstatemachine.cpp
index e5d019dc8b..ee522218ee 100644
--- a/src/corelib/statemachine/qstatemachine.cpp
+++ b/src/corelib/statemachine/qstatemachine.cpp
@@ -1946,12 +1946,14 @@ void QStateMachinePrivate::_q_process()
                 }
         }
         if (enabledTransitions.isEmpty()) {
-            processing = false;
-            stopProcessingReason = EventQueueEmpty;
-            noMicrostep();
+            if (isInternalEventQueueEmpty()) {
+                processing = false;
+                stopProcessingReason = EventQueueEmpty;
+                noMicrostep();
 #ifdef QSTATEMACHINE_DEBUG
-            qDebug() << q << ": no transitions enabled";
+                qDebug() << q << ": no transitions enabled";
 #endif
+            }
         } else {
             didChange = true;
             q->beginMicrostep(e);