[Development] QtQuickComponents ComboBox with QEglFSWindow

[Matt Broadstone]

Hi,
We're experiencing an odd crash while running our Qt Quick application in a
VirtualBox session using eglfs on the framebuffer. The application works
perfectly passing the '-platform eglfs' options, however, when we try to
use a ComboBox we get a segfault/qFatal, with the resulting backtrace (only
first twelve frames included for "brevity"):

#0  0x00007eff7c041389 in raise () from /usr/lib/libc.so.6
#1  0x00007eff7c042788 in abort () from /usr/lib/libc.so.6
#2  0x00007eff7c956895 in qt_message_fatal (context=..., message=...)
at global/qlogging.cpp:979
#3  QMessageLogger::fatal (this=this at entry=0x7fff32b96030,
msg=msg at entry=0x7eff7768e380 "EGLFS: OpenGL windows cannot be mixed
with others.") at global/qlogging.cpp:384
#4  0x00007eff7766cfb7 in QEglFSWindow::create
(this=this at entry=0x1db8030) at qeglfswindow.cpp:115
#5  0x00007eff7766b60e in QEglFSIntegration::createPlatformWindow
(this=<optimized out>, window=0x1db66f0) at qeglfsintegration.cpp:122
#6  0x00007eff7d03180b in QWindow::create (this=this at entry=0x1db66f0)
at kernel/qwindow.cpp:480
#7  0x00007eff7d032150 in QWindow::setVisible (this=0x1db66f0,
visible=<optimized out>) at kernel/qwindow.cpp:426
#8  0x00007eff6c888d6a in QQuickPopupWindow::show
(this=this at entry=0x1db66f0) at qquickpopupwindow.cpp:95
#9  0x00007eff6c888579 in QQuickMenuPopupWindow::show (this=0x1db66f0)
at qquickmenupopupwindow.cpp:57
#10 0x00007eff6c884efb in QQuickMenu::__popup (this=0x1bff2e0,
x=<optimized out>, y=<optimized out>, atItemIndex=0) at
qquickmenu.cpp:403
#11 0x00007eff6c897f53 in QQuickMenu::qt_static_metacall
(_o=_o at entry=0x1bff2e0, _c=_c at entry=QMetaObject::InvokeMetaMethod,
_id=_id at entry=22, _a=_a at entry=0x7fff32b96550) at
.moc/moc_qquickmenu_p.cpp:227
#12 0x00007eff6c898427 in QQuickMenu::qt_metacall (this=0x1bff2e0,
_c=QMetaObject::InvokeMetaMethod, _id=22, _a=0x7fff32b96550) at
.moc/moc_qquickmenu_p.cpp:330

There is some mention on the i.MX6 wiki page about multiple windows (
http://qt-project.org/wiki/i.MX-6), but that appears to be related to
mixing Quick views and widgets, which we are not doing. There also seems to
be an existing ComboBox bug (
https://bugreports.qt-project.org/browse/QTBUG-35989), but this looks like
it's quite different.

Any insight would be appreciated, I just wanted to do some further
investigation here before creating the bug report.

Matt
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