Comment 8 for bug 939573

Took me many many attempts to make this happen, captured output in gdb.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6366ee2 in QCoreApplication::removePostedEvents(QObject*, int) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
(gdb) br
Breakpoint 1 at 0x7ffff6366ee2
(gdb) bt
#0 0x00007ffff6366ee2 in QCoreApplication::removePostedEvents(QObject*, int) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#1 0x00007ffff501daea in QWidget::setVisible(bool) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#2 0x00000000004299bb in ContactViewHoverButton::setVisible (this=0x81e2c0, visible=true)
    at /home/david/telepathy/ktp-contact-list/contact-view-hover-button.cpp:100
#3 0x000000000042ce9e in QWidget::show (this=0x81e2c0) at /usr/include/qt4/QtGui/qwidget.h:487
#4 0x000000000042bd5b in AbstractWidgetDelegateOverlay::slotEntered (this=0x81f510, index=...)
    at /home/david/telepathy/ktp-contact-list/contact-delegate-overlay.cpp:184
#5 0x000000000042c17d in HoverButtonDelegateOverlay::slotEntered (this=0x81f510, index=...)
    at /home/david/telepathy/ktp-contact-list/contact-delegate-overlay.cpp:304
#6 0x000000000042ce51 in HoverButtonDelegateOverlay::qt_metacall (this=0x81f510, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fffff7ff730)
    at /home/david/telepathy/ktp-contact-list/build/contact-delegate-overlay.moc:239
#7 0x000000000042acd4 in StartChannelContactOverlay::qt_metacall (this=0x81f510, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0x7fffff7ff730)
    at /home/david/telepathy/ktp-contact-list/build/contact-overlays.moc:73
#8 0x000000000042ae78 in TextChannelContactOverlay::qt_metacall (this=0x81f510, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0x7fffff7ff730)
    at /home/david/telepathy/ktp-contact-list/build/contact-overlays.moc:138
#9 0x00007ffff6376eba in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007ffff54d77f5 in QAbstractItemView::entered(QModelIndex const&) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#11 0x00007ffff54d7958 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#12 0x00007ffff54db93c in QAbstractItemView::mouseMoveEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#13 0x000000000041ee74 in ContactListWidget::mouseMoveEvent (this=0x86f1c0, event=0x7fffff800520)
    at /home/david/telepathy/ktp-contact-list/contact-list-widget.cpp:575
#14 0x00007ffff5019d1e in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#15 0x00007ffff53c25b6 in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#16 0x00007ffff54d325b in QAbstractItemView::viewportEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4