Thread 1 "spectacle" received signal SIGSEGV, Segmentation fault.
0x00007ffff68ed165 in void QWidgetPrivate::update<QRect>(QRect) ()
   from /usr/lib/libQt5Widgets.so.5
(gdb) bt
#0  0x00007ffff68ed165 in void QWidgetPrivate::update<QRect>(QRect) ()
   from /usr/lib/libQt5Widgets.so.5
#1  0x00007ffff68d8f0d in QWidget::update() () from /usr/lib/libQt5Widgets.so.5
#2  0x00005555555b1c9c in QuickEditor::mouseReleaseEvent(QMouseEvent*) ()
#3  0x00007ffff68eaaf8 in QWidget::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#4  0x00007ffff68a9da4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#5  0x00007ffff68b1609 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#6  0x00007ffff5b29849 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/libQt5Core.so.5
#7  0x00007ffff68b0937 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) ()
   from /usr/lib/libQt5Widgets.so.5
#8  0x00007ffff690656b in ?? () from /usr/lib/libQt5Widgets.so.5
#9  0x00007ffff6908cd7 in ?? () from /usr/lib/libQt5Widgets.so.5
#10 0x00007ffff68a9da4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#11 0x00007ffff68b13c1 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#12 0x00007ffff5b29849 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/libQt5Core.so.5
#13 0x00007ffff60b152d in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/libQt5Gui.so.5
#14 0x00007ffff60b2956 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#15 0x00007ffff608bd9c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#16 0x00007ffff026cb8c in ?? () from /usr/lib/libQt5XcbQpa.so.5
#17 0x00007ffff2eb57bf in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007ffff2eb7739 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007ffff2eb777e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007ffff5b7e969 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#21 0x00007ffff5b284dc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#22 0x00007ffff5b30596 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#23 0x000055555557ce85 in main ()