Unset the QQmlAnimationTimer pointer from unregistered jobs

Amends 4b125a5bfdd935d260118406c343535e76023200, which reset the pointer
in registered jobs when the timer was destroyed. However, if a job is
unregistered explicitly before the timer is destroyed, then the job's
m_timer pointer might still be a dangling pointer, resulting in a crash
when the job is reactivated later.

So clear the job's pointer to QQmlAnimationTimer whenever it is
unregistered from the timer. Since a running job can then have a nullptr
timer, only assert in the job's destructor if the timer is not nullptr.

Introduce a test case that reliably crashes without the fix. The test
is added to the QQuickAnimation test as it uses a Qt Quick UI.

Fixes: QTBUG-98248
Change-Id: Ief991900c50aefd480d9c79e83324968102ca29c
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
(cherry picked from commit 9c732286ed72afe8cc2d2062e6cedbe5f6a06447)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions