Make the animation timer more consistent

We ensure that the startStop timer is always ticking before the
animation timer.

Task-number: QTBUG-5967
Reviewed-by: Aaron Kennedy

1 files changed, 7 insertions, 2 deletions

diff --git a/src/corelib/animation/qabstractanimation.cpp b/src/corelib/animation/qabstractanimation.cpp
index ef4989bc4f..299585a0de 100644
--- a/src/corelib/animation/qabstractanimation.cpp
+++ b/src/corelib/animation/qabstractanimation.cpp
@@ -229,7 +229,10 @@ void QUnifiedTimer::restartAnimationTimer()
 
 void QUnifiedTimer::timerEvent(QTimerEvent *event)
 {
-    if (event->timerId() == startStopAnimationTimer.timerId()) {
+    //in the case of consistent timing we make sure the orders in which events come is always the same
+   //for that purpose we do as if the startstoptimer would always fire before the animation timer
+    if ((consistentTiming && startStopAnimationTimer.isActive()) ||
+        event->timerId() == startStopAnimationTimer.timerId()) {
         startStopAnimationTimer.stop();
 
         //we transfer the waiting animations into the "really running" state
@@ -247,7 +250,9 @@ void QUnifiedTimer::timerEvent(QTimerEvent *event)
                 time.start();
             }
         }
-    } else if (event->timerId() == animationTimer.timerId()) {
+    }
+
+    if (event->timerId() == animationTimer.timerId()) {
         // update current time on all top level animations
         updateAnimationsTime();
         restartAnimationTimer();