Something

Breakpoint 2, KHTMLView::viewportEvent (this=0xbe92c0, e=<value optimized out>)
    at /home/chehrlic/kde4/kdesvn/kdelibs/khtml/khtmlview.cpp:2010
2010              QPaintEvent pe(r);
(gdb) n
280     { y1 = ay; }
(gdb)
2010              QPaintEvent pe(r);
(gdb)
280     { y1 = ay; }
(gdb)
2010              QPaintEvent pe(r);
(gdb)
2011              paintEvent(&pe);
(gdb)
QPainter::begin: Widget painting can only begin as a result of a paintEvent
2012              return true;
(gdb)
2018    }
(gdb) bt
#0  KHTMLView::viewportEvent (this=0xbe92c0, e=0x2b8ccfef8e58)
    at /home/chehrlic/kde4/kdesvn/kdelibs/khtml/khtmlview.cpp:2018
#1  0x00002b8cce76fd78 in QAbstractScrollAreaFilter::eventFilter (this=<value optimized out>, o=<value optimized out>,
    e=0xe88e30) at /home/chehrlic/kde4/kdesvn/qt-copy/src/gui/widgets/qabstractscrollarea_p.h:95
#2  0x00002b8cce440c4f in QApplicationPrivate::notify_helper (this=0x61f2a0, receiver=0x8e8e10, e=0x7fffe17e4690)
    at /home/chehrlic/kde4/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3550
#3  0x00002b8cce447085 in QApplication::notify (this=0x7fffe17e7bc0, receiver=0x8e8e10, e=0x7fffe17e4690)
    at /home/chehrlic/kde4/kdesvn/qt-copy/src/gui/kernel/qapplication.cpp:3499
#4  0x00002b8cca98671b in KApplication::notify (this=0x7fffe17e7bc0, receiver=0x8e8e10, event=0x7fffe17e4690)
    at /home/chehrlic/kde4/kdesvn/kdelibs/kdeui/kernel/kapplication.cpp:319
#5  0x00002b8ccd90fa40 in QCoreApplication::notifyInternal (this=0x7fffe17e7bc0, receiver=0x8e8e10, event=0x7fffe17e4690)
    at /home/chehrlic/kde4/kdesvn/qt-copy/src/corelib/kernel/qcoreapplication.cpp:532
#6  0x00002b8cce4871cc in qt_sendSpontaneousEvent (receiver=0x31, event=0xe88e30)
    at ../../include/QtCore/../../../../qt-copy/src/corelib/kernel/qcoreapplication.h:205
#7  0x00002b8cce5815d9 in QWidgetPrivate::drawWidget (this=<value optimized out>, pdev=0x75c278, rgn=@0x7fffe17e4940,
    offset=@0x7fffe17e4920, flags=<value optimized out>)
    at /home/chehrlic/kde4/kdesvn/qt-copy/src/gui/painting/qbackingstore.cpp:1212
#8  0x00002b8cce5810f1 in QWidgetBackingStore::paintSiblingsRecursive (pdev=0x75c278, siblings=@0x7fffe17e4b40, index=2,
    rgn=@0x7fffe17e4ce0, offset=@0x7fffe17e4cc0, flags=4)
    at /home/chehrlic/kde4/kdesvn/qt-copy/src/gui/painting/qbackingstore.cpp:1115
#9  0x00002b8cce581289 in QWidgetPrivate::drawWidget (this=0x9d13b0, pdev=0x75c278, rgn=@0x7fffe17e4ce0,
    offset=@0x7fffe17e4cc0, flags=<value optimized out>)
    at /home/chehrlic/kde4/kdesvn/qt-copy/src/gui/painting/qbackingstore.cpp:1248
#10 0x00002b8cce5810f1 in QWidgetBackingStore::paintSiblingsRecursive (pdev=0x75c278, siblings=@0x7fffe17e4ee0, index=2,
    rgn=@0x7fffe17e5080, offset=@0x7fffe17e5060, flags=4)