Delete transition when it's canceled

If next transition occurs before previous transition ends, the
animation of the previous transition is canceled. The problem is
that it is not removed from A while it is being canceled.
At this time, if a new job comes in translator->runningJobs,'busy'
state cannot return back to its original state and mouseEvent/
touchEvent are broken.
So, in case of transition canceled, we should remove the transition.

Fixes: QTBUG-104491
Change-Id: I33083822763bdc006eb35262b9c216f27989139a
Reviewed-by: Bumjoon Park <bumjoon.park@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit 572b3ae9f32d039ed2b14a50731e939422646da4)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/quick/items/qquickitemviewtransition.cpp b/src/quick/items/qquickitemviewtransition.cpp
index 9cb5864436..cf3176201e 100644
--- a/src/quick/items/qquickitemviewtransition.cpp
+++ b/src/quick/items/qquickitemviewtransition.cpp
@@ -579,6 +579,8 @@ void QQuickItemViewTransitionableItem::stopTransition()
 {
     if (transition)
         RETURN_IF_DELETED(transition->cancel());
+    delete transition;
+    transition = nullptr;
     clearCurrentScheduledTransition();
     resetNextTransitionPos();
 }