Crash in the engine setup widget

[cryos]

Qt 4.3.1, r656

Steps to reproduce:

1. Open Avogadro
2. In the "Engine Configuration" switch to the "Primitives" Tab
3. Click on the rightmost button (the green arrow).

It crashes. Note that I don't have any engines in the white widget above.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1225537840 (LWP 5214)]
0x08068f10 in Avogadro::EngineSetupWidget::addAll ()
(gdb) bt
#0 0x08068f10 in Avogadro::EngineSetupWidget::addAll ()
#1 0x0806921d in Avogadro::EngineSetupWidget::qt_metacall ()
#2 0xb74e2081 in QMetaObject::activate () from /usr//lib/libQtCore.so.4
#3 0xb74e2390 in QMetaObject::activate () from /usr//lib/libQtCore.so.4
#4 0xb7d60ec1 in QAbstractButton::clicked () from /usr//lib/libQtGui.so.4
#5 0xb7b4c969 in QButtonGroup::id () from /usr//lib/libQtGui.so.4
#6 0xb7b4d869 in QAbstractButton::focusInEvent () from /usr//lib/libQtGui.so.4
#7 0xb7b4da90 in QAbstractButton::mouseReleaseEvent () from /usr//lib/libQtGui.so.4
#8 0xb7c06f5c in QToolButton::mouseReleaseEvent () from /usr//lib/libQtGui.so.4
#9 0xb78ccfb2 in QWidget::event () from /usr//lib/libQtGui.so.4
#10 0xb7b4e133 in QAbstractButton::event () from /usr//lib/libQtGui.so.4
#11 0xb7c06874 in QToolButton::event () from /usr//lib/libQtGui.so.4
#12 0xb7888cf0 in QApplicationPrivate::notify_helper () from /usr//lib/libQtGui.so.4
#13 0xb788f027 in QApplication::notify () from /usr//lib/libQtGui.so.4
#14 0xb74d0ecb in QCoreApplication::notifyInternal () from /usr//lib/libQtCore.so.4
#15 0xb78dea86 in QApplication::x11ProcessEvent () from /usr//lib/libQtGui.so.4
#16 0xb78de1a3 in QApplication::x11ProcessEvent () from /usr//lib/libQtGui.so.4
#17 0xb7900ddb in QX11Info::copyX11Data () from /usr//lib/libQtGui.so.4
#18 0xb6fafde2 in g_main_context_dispatch () from /opt/gnome/lib/libglib-2.0.so.0
#19 0xb6fb2e1f in g_main_context_prepare () from /opt/gnome/lib/libglib-2.0.so.0
#20 0xb6fb3385 in g_main_context_iteration () from /opt/gnome/lib/libglib-2.0.so.0
#21 0xb74f2808 in QEventDispatcherGlib::processEvents () from /usr//lib/libQtCore.so.4
#22 0xb7900bc5 in QX11Info::copyX11Data () from /usr//lib/libQtGui.so.4
#23 0xb74d0408 in QEventLoop::processEvents () from /usr//lib/libQtCore.so.4
#24 0xb74d051c in QEventLoop::exec () from /usr//lib/libQtCore.so.4
#25 0xb74d25d8 in QCoreApplication::exec () from /usr//lib/libQtCore.so.4

---Type to continue, or q to quit---
#26 0xb7888407 in QApplication::exec () from /usr//lib/libQtGui.so.4
#27 0x0806d2a7 in main ()

Reported by: @cniehaus

[cryos]

Logged In: YES
user_id=1883751
Originator: NO

I can confirm that in rev661.

Original comment by: soc88

[cryos]

Logged In: YES
user_id=1500648
Originator: NO

Fixed in commit #718

Original comment by: @milkypostman