[Qt-interest] Adding PyQt QDockWidget to Qt's QMainWindow

[Chitturi, Devendra_NagaKumar]

Hi,

Our requirement is to add a PyQt QDockWidget to a cpp Qt's QMainWindow.  We were able to do that by getting the cpp QMainWindow's instance in PyQt and making that parent to the PyQt's QDockWidget.  But, in below cases it crashes.

1. Sometimes it crashes when re-docking the PyQt QDockWidget to a cpp's QMainWindow, which was undocked from the same cpp's QMainWindow.
Backtrace:
0   QtGui                               0x000000010d989b53 QDockAreaLayoutInfo::indexOf(QWidget*) const + 163
1   QtGui                               0x000000010d989b30 QDockAreaLayoutInfo::indexOf(QWidget*) const + 128
2   QtGui                               0x000000010d989cba QDockAreaLayout::indexOf(QWidget*) const + 74
3   QtGui                               0x000000010d9b39ce QMainWindowLayoutState::indexOf(QWidget*) const + 366
4   QtGui                               0x000000010d9b4025 QMainWindowLayout::plug(QLayoutItem*) + 165
5   QtGui                               0x000000010d979103 QDockWidgetPrivate::endDrag(bool) + 339
6   QtGui                               0x000000010d97aef5 QDockWidgetPrivate::nonClientAreaMouseEvent(QMouseEvent*) + 293
7   QtGui                               0x000000010d97b46b QDockWidget::event(QEvent*) + 907
8   QtGui.so                            0x0000000128eefe5b sipQDockWidget::event(QEvent*) + 123
9   QtGui                               0x000000010d5bbd9d QApplicationPrivate::notify_helper(QObject*, QEvent*) + 189
10  QtGui                               0x000000010d5c1bfd QApplication::notify(QObject*, QEvent*) + 349
11  QtCore                              0x0000000108e865fc QCoreApplication::notifyInternal(QObject*, QEvent*) + 124

2. It crashes consistently when undocking the PyQt QDockWidget by holding its title area and moving it (When it was docked to a cpp's QMainWindow).
Backtrace:
0   QtGui                               0x000000010d9ad466 fixToolBarOrientation(QLayoutItem*, int) + 22
1   QtGui                               0x000000010d9b3ee5 QMainWindowLayout::unplug(QWidget*) + 1077
2   QtGui                               0x000000010d978952 QDockWidgetPrivate::startDrag() + 130
3   QtGui                               0x000000010d97937c QDockWidgetPrivate::mouseMoveEvent(QMouseEvent*) + 396
4   QtGui                               0x000000010d97b4b5 QDockWidget::event(QEvent*) + 981
5   QtGui.so                            0x00000001287b3e5b sipQDockWidget::event(QEvent*) + 123
6   QtGui                               0x000000010d5bbd9d QApplicationPrivate::notify_helper(QObject*, QEvent*) + 189
7   QtGui                               0x000000010d5c3900 QApplication::notify(QObject*, QEvent*) + 7776
8   QtCore                              0x0000000108e865fc QCoreApplication::notifyInternal(QObject*, QEvent*) + 124

Any suggestion or workaround to fix these issues would be much appreciated.

- Devendra


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