[akregator] [Bug 378513] kontact or akregator crash after close/restart

[Alexey A Nikitin]

https://bugs.kde.org/show_bug.cgi?id=378513

--- Comment #22 from Alexey A Nikitin <moonwalker at syrius.us> ---
I noticed that I still get similar stack trace on exiting Kontact with
Akregator embedded in it if I exit it while it's minimized to tray:

Thread 1 (Thread 0x7fc49d7cd900 (LWP 4503)):
[KCrash Handler]
#6  0x00007fc4ba4ce2b7 in QMetaObject::cast (this=0x7fc38c4041e0
<Akregator::WebEngineFrame::staticMetaObject>, obj=obj at entry=0x2773970) at
kernel/qmetaobject.cpp:366
#7  0x00007fc4ba4ce2f5 in QMetaObject::cast (this=<optimized out>,
obj=obj at entry=0x2773970) at kernel/qmetaobject.cpp:355
#8  0x00007fc38c1a220a in qobject_cast<Akregator::WebEngineFrame*>
(object=0x2773970) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject.h:514
#9  Akregator::FrameManager::saveProperties (this=0x25d03b0, config=...) at
/workspace/build/src/frame/framemanager.cpp:281
#10 0x00007fc38c68a53f in Akregator::MainWidget::saveProperties
(this=<optimized out>, config=...) at /workspace/build/src/mainwidget.cpp:1237
#11 0x00007fc38c683186 in Akregator::Part::autoSaveProperties
(this=this at entry=0x259f9a0) at /workspace/build/src/akregator_part.cpp:860
#12 0x00007fc38c683219 in Akregator::Part::slotOnShutdown (this=0x259f9a0) at
/workspace/build/src/akregator_part.cpp:394
#13 0x00007fc4ba4f13f6 in QtPrivate::QSlotObjectBase::call (a=0x7ffe9a4835a0,
r=0x259f9a0, this=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101
#14 QMetaObject::activate (sender=0x7ffe9a483890, signalOffset=<optimized out>,
local_signal_index=local_signal_index at entry=0, argv=argv at entry=0x7ffe9a4835a0)
at kernel/qobject.cpp:3749
#15 0x00007fc4ba4f19d7 in QMetaObject::activate (sender=<optimized out>,
m=m at entry=0x7fc4ba7824a0 <QCoreApplication::staticMetaObject>,
local_signal_index=local_signal_index at entry=0, argv=argv at entry=0x7ffe9a4835a0)
at kernel/qobject.cpp:3628
#16 0x00007fc4ba569fa7 in QCoreApplication::aboutToQuit (this=<optimized out>,
_t1=...) at .moc/moc_qcoreapplication.cpp:250
#17 0x00007fc4ba4c7acb in QCoreApplicationPrivate::execCleanup (this=0x1a70ba0)
at kernel/qcoreapplication.cpp:1311
#18 0x00007fc4ba4cbdcc in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1295
#19 0x0000000000404427 in main (argc=1, argv=0x7ffe9a4839e8) at
/workspace/build/src/main.cpp:227

If the window is visible no crash occurs.

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