~"#0  0x00007f67bdbe4977 in QGraphicsItem::hasFocus (this=0xffa320) at graphicsview/qgraphicsitem.cpp:3214\n"
>~"#1  0x00007f67bd8de701 in QWidget::hasFocus (this=0xfdaff0) at kernel/qwidget.cpp:5845\n"
>~"#2  0x00007f67bd8dee62 in QWidget::clearFocus (this=0xfdaff0) at kernel/qwidget.cpp:6041\n"
>~"#3  0x00007f67bd8d2969 in QWidget::~QWidget (this=0xfdaff0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1394\n"
>~"#4  0x00007f67bd8d2c70 in QWidget::~QWidget (this=0xfdaff0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1485\n"
>~"#5  0x00007f67bcb3ac48 in QObjectPrivate::deleteChildren (this=0x1057c90) at kernel/qobject.cpp:1764\n"
>~"#6  0x00007f67bd8d2b59 in QWidget::~QWidget (this=0xf643b0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1465\n"
>~"#7  0x00007f67bda0d24a in QFrame::~QFrame (this=0xf643b0, __in_chrg=<optimized out>) at widgets/qframe.cpp:217\n"
>~"#8  0x00007f67bdaa4d41 in QAbstractScrollArea::~QAbstractScrollArea (this=0xf643b0, __in_chrg=<optimized out>) at widgets/qabstractscrollarea.cpp:567\n"
>~"#9  0x00007f67bdb3818c in QAbstractItemView::~QAbstractItemView (this=0xf643b0, __in_chrg=<optimized out>) at itemviews/qabstractitemview.cpp:630\n"
>~"#10 0x00007f67bdb5a8d0 in QListView::~QListView (this=0xf643b0, __in_chrg=<optimized out>) at itemviews/qlistview.cpp:206\n"
>~"#11 0x00007f67bdcc4723 in QComboBoxListView::~QComboBoxListView (this=0xf643b0, __in_chrg=<optimized out>) at .moc/debug-shared/../../widgets/qcombobox_p.h:83\n"
>~"#12 0x00007f67bdcc475c in QComboBoxListView::~QComboBoxListView (this=0xf643b0, __in_chrg=<optimized out>) at .moc/debug-shared/../../widgets/qcombobox_p.h:83\n"
>~"#13 0x00007f67bcb3ac48 in QObjectPrivate::deleteChildren (this=0xff8bf0) at kernel/qobject.cpp:1764\n"
>~"#14 0x00007f67bd8d2b59 in QWidget::~QWidget (this=0xfddaf0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1465\n"
>~"#15 0x00007f67bda0d24a in QFrame::~QFrame (this=0xfddaf0, __in_chrg=<optimized out>) at widgets/qframe.cpp:217\n"
>~"#16 0x00007f67bdcc45fe in QComboBoxPrivateContainer::~QComboBoxPrivateContainer (this=0xfddaf0, __in_chrg=<optimized out>) at .moc/debug-shared/../../widgets/qcombobox_p.h:216\n"
>~"#17 0x00007f67bdcc4636 in QComboBoxPrivateContainer::~QComboBoxPrivateContainer (this=0xfddaf0, __in_chrg=<optimized out>) at .moc/debug-shared/../../widgets/qcombobox_p.h:216\n"
>~"#18 0x00007f67bcb3ac48 in QObjectPrivate::deleteChildren (this=0xf4be00) at kernel/qobject.cpp:1764\n"
>~"#19 0x00007f67bd8d2b59 in QWidget::~QWidget (this=0xf4bc40, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1465\n"
>~"#20 0x00007f67bd9d61a0 in QComboBox::~QComboBox (this=0xf4bc40, __in_chrg=<optimized out>) at widgets/qcombobox.cpp:1267\n"
>~"#21 0x00007f67bd9d61e0 in QComboBox::~QComboBox (this=0xf4bc40, __in_chrg=<optimized out>) at widgets/qcombobox.cpp:1278\n"
>~"#22 0x00007f67bdc10844 in QGraphicsProxyWidget::~QGraphicsProxyWidget (this=0xf4b7c0, __in_chrg=<optimized out>) at graphicsview/qgraphicsproxywidget.cpp:518\n"
>~"#23 0x0000000000406ec0 in ProxyWidget::~ProxyWidget (this=0xf4b7c0, __in_chrg=<optimized out>) at graphics.cpp:53\n"

>~"#24 0x0000000000406f20 in ProxyWidget::~ProxyWidget (this=0xf4b7c0, __in_chrg=<optimized out>) at graphics.cpp:56\n"
>~"#25 0x00007f67bdc1d24e in QGraphicsScene::clear (this=0xf34910) at graphicsview/qgraphicsscene.cpp:2356\n"
>~"#26 0x00007f67bdc1b79c in QGraphicsScene::~QGraphicsScene (this=0xf34910, __in_chrg=<optimized out>) at graphicsview/qgraphicsscene.cpp:1677\n"
>~"#27 0x00007f67bdc1b82c in QGraphicsScene::~QGraphicsScene (this=0xf34910, __in_chrg=<optimized out>) at graphicsview/qgraphicsscene.cpp:1682\n"
>~"#28 0x00007f67bcb3ac48 in QObjectPrivate::deleteChildren (this=0xf333f0) at kernel/qobject.cpp:1764\n"
>~"#29 0x00007f67bd8d2b59 in QWidget::~QWidget (this=0x7fffe69aac00, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1465\n"
>~"#30 0x000000000040679c in Graphics::~Graphics (this=0x7fffe69aac00, __in_chrg=<optimized out>) at graphics.h:13\n"
>~"#31 0x00000000004066b3 in main (argc=1, argv=0x7fffe69aad58) at main.cpp:10\n"