Comment 2 for bug 1503261

StacktraceTop:
 Avogadro::GLWidget::undoStack (this=0x8ec6dc0) at /build/avogadro-fEWzzu/avogadro-1.1.1/libavogadro/src/glwidget.cpp:2206
 Avogadro::ManipulateTool::applyManualManipulation (this=0x8625280) at /build/avogadro-fEWzzu/avogadro-1.1.1/libavogadro/src/tools/manipulatetool.cpp:106
 Avogadro::ManipulateTool::buttonClicked (this=0x8625280, button=0x907b008) at /build/avogadro-fEWzzu/avogadro-1.1.1/libavogadro/src/tools/manipulatetool.cpp:173
 Avogadro::ManipulateTool::qt_static_metacall (_o=0x8625280, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbf8709c4) at /build/avogadro-fEWzzu/avogadro-1.1.1/obj-i686-linux-gnu/libavogadro/src/tools/moc_manipulatetool.cxx:49
 QMetaObject::activate (sender=0x907c0a8, m=0xb740d738 <QDialogButtonBox::staticMetaObject>, local_signal_index=0, argv=0xbf8709c4) at kernel/qobject.cpp:3567