[Qt-interest] Weird ASSERT when using QWizard

[Andre Somers]

Hi,

I am running into a very weird problem when using QWizard. I get this 
ASSERT:
"ASSERT: "w->testAttribute(Qt::WA_WState_Created)" in file 
inputmethod\qwininputcontext_win.cpp, line 377"

I forced my app to crash when that happens, so I can get a proper 
backtrace. The trace is attached at the bottom. Note that it only 
contains Qt code, no code of my own. Line 8 looks suspicious. If I 
ignore the ASSERT, I get the same message again twice (once for line 501 
and once for line 377 again), after which the wizard works just fine.

A very weird thing is, that if I change the order of the pages, the 
wizard runs without any issues. I really don't see why this may be the 
case though. The code is quite simple and does nothing out of the 
ordinairy. The ASSERT is 100% reproducible for me.

I am running on windows 7 with a touch screen enabled. The compiler is 
MSVC.

Any tips on what might be going wrong here would be very welcome!

André

stacktrace:
0    qt_message_output    qglobal.cpp    2270    0x67057eed
1    qt_message    qglobal.cpp    2328    0x67058069
2    qFatal    qglobal.cpp    2511    0x67058459
3    qt_assert    qglobal.cpp    2027    0x67057a29
4    QWinInputContext::update    qwininputcontext_win.cpp    377    
0x65833eb1
5    QWinInputContext::setFocusWidget    qwininputcontext_win.cpp    
765    0x65835191
6    QWidget::setAttribute    qwidget.cpp    10694    0x650f73f5
7    QWidget::winId    qwidget.cpp    2464    0x650e6c08
8    QAccessible::updateAccessibility    qaccessible_win.cpp    286    
0x65748553
9    QListView::currentChanged    qlistview.cpp    3097    0x6577d8de
10    QAbstractItemView::qt_metacall    moc_qabstractitemview.cpp    
238    0x65759bb1
11    QListView::qt_metacall    moc_qlistview.cpp    111    0x659577cd
12    QMetaObject::metacall    qmetaobject.cpp    238    0x671ccb31
13    QMetaObject::activate    qobject.cpp    3278    0x671e4426
14    QItemSelectionModel::currentChanged    
moc_qitemselectionmodel.cpp    159    0x657be231
15    QItemSelectionModel::setCurrentIndex    qitemselectionmodel.cpp    
1171    0x657bbf57
16    QAbstractItemView::focusInEvent    qabstractitemview.cpp    
2102    0x65751f99
17    QWidget::event    qwidget.cpp    8370    0x650f2bc6
18    QFrame::event    qframe.cpp    557    0x655daf82
19    QAbstractScrollArea::event    qabstractscrollarea.cpp    996    
0x656917c3
20    QAbstractItemView::event    qabstractitemview.cpp    1556    
0x6574f83a
21    QListView::event    qlistview.cpp    1633    0x657774c3
22    QApplicationPrivate::notify_helper    qapplication.cpp    4454    
0x6507161e
23    QApplication::notify    qapplication.cpp    4419    0x650712d5
24    QCoreApplication::notifyInternal    qcoreapplication.cpp    732    
0x671c3051
25    QCoreApplication::sendEvent    qcoreapplication.h    215    
0x671c81f9
26    QApplicationPrivate::setFocusWidget    qapplication.cpp    2240    
0x6506c735
27    QWidget::setFocus    qwidget.cpp    6356    0x650eef60
28    QWidget::setFocus    qwidget.h    422    0x650ccb81
29    QWizardPrivate::switchToPage    qwizard.cpp    886    0x657290c0
30    QWizard::next    qwizard.cpp    3116    0x6572edf9
31    QWizard::qt_metacall    moc_qwizard.cpp    170    0x6572fff0
32    MainWindow::qt_metacall    moc_mainwindow.cpp    64    0x40504c
33    QMetaObject::metacall    qmetaobject.cpp    238    0x671ccb31
34    QMetaObject::activate    qobject.cpp    3278    0x671e4426
35    QAbstractButton::clicked    moc_qabstractbutton.cpp    206    
0x6594fc5b
36    QAbstractButtonPrivate::emitClicked    qabstractbutton.cpp    
548    0x655710cd
37    QAbstractButtonPrivate::click    qabstractbutton.cpp    540    
0x65571048
38    QAbstractButton::mouseReleaseEvent    qabstractbutton.cpp    
1122    0x65572204
39    QWidget::event    qwidget.cpp    8261    0x650f26e4
40    QAbstractButton::event    qabstractbutton.cpp    1081    0x6557203f
41    QPushButton::event    qpushbutton.cpp    684    0x65647d9b
42    QApplicationPrivate::notify_helper    qapplication.cpp    4454    
0x6507161e
43    QApplication::notify    qapplication.cpp    4015    0x6506f958
44    QCoreApplication::notifyInternal    qcoreapplication.cpp    732    
0x671c3051
45    QCoreApplication::sendSpontaneousEvent    qcoreapplication.h    
218    0x6726d978
46    QApplicationPrivate::sendMouseEvent    qapplication.cpp    3112    
0x6506e52a
47    QETWidget::translateMouseEvent    qapplication_win.cpp    3321    
0x651319da
48    QtWndProc    qapplication_win.cpp    1659    0x6512cfad
49    InternalCallWinProc    USER32    0    0x751886ef
50    UserCallWinProcCheckWow    USER32    0    0x75188876
51    DispatchMessageWorker    USER32    0    0x751889b5
52    DispatchMessageW    USER32    0    0x75188e9c
53    QEventDispatcherWin32::processEvents    
qeventdispatcher_win.cpp    793    0x67207c66
54    QGuiEventDispatcherWin32::processEvents    qapplication_win.cpp    
1170    0x6512bafe
55    QEventLoop::processEvents    qeventloop.cpp    150    0x671c0b5e
56    QEventLoop::exec    qeventloop.cpp    201    0x671c0c90
57    QCoreApplication::exec    qcoreapplication.cpp    1009    0x671c35cd
58    QApplication::exec    qapplication.cpp    3729    0x6506ef88
59    main    main.cpp    36    0x4015f3
60    WinMain    qtmain_win.cpp    131    0x40732a
61    __tmainCRTStartup    crtexe.c    578    0x406808
62    WinMainCRTStartup    crtexe.c    403    0x40656f
63    BaseThreadInitThunk    kernel32    0    0x76b11194
64    __RtlUserThreadStart    ntdll    0    0x774db495
65    _RtlUserThreadStart    ntdll    0    0x774db468