#39 0xb735915d in QApplication::notify (this=0xbfffe008, receiver=0x819fa00,
    e=0xbfffe008) at kernel/qapplication.cpp:4284
#40 0xb7e660fe in QCoreApplication::notifyInternal (this=0xbfffef20,
    receiver=0x819fa00, event=0xbfffe008) at kernel/qcoreapplication.cpp:876
#41 0xb7a272f4 in sendEvent (event=<optimized out>, receiver=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#42 QGraphicsView::wheelEvent (this=0x819f9e0, event=0xbfffe634)
    at graphicsview/qgraphicsview.cpp:3376
#43 0xb73ae6cf in QWidget::event (this=0x819f9e0, event=0xbfffe634)
    at kernel/qwidget.cpp:8369
#44 0xb77cb1c5 in QFrame::event (this=0x819f9e0, e=0xbfffe634)
    at widgets/qframe.cpp:557
#45 0xb785deb1 in QAbstractScrollArea::viewportEvent (this=0x819f9e0,
    e=0xbfffe634) at widgets/qabstractscrollarea.cpp:1043
#46 0xb7a315bc in QGraphicsView::viewportEvent (this=0x819f9e0,
    event=0xbfffe634) at graphicsview/qgraphicsview.cpp:2866
#47 0xb78605d6 in viewportEvent (this=<optimized out>, event=0xbfffe634)
    at widgets/qabstractscrollarea_p.h:100
#48 eventFilter (e=0xbfffe634, this=<optimized out>, o=<optimized out>)
    at widgets/qabstractscrollarea_p.h:116
#49 QAbstractScrollAreaFilter::eventFilter (this=0x819dc68, o=0x81a5bf0,
    e=0xbfffe634) at widgets/qabstractscrollarea_p.h:115
#50 0xb7e66296 in QCoreApplicationPrivate::sendThroughObjectEventFilters (