QtC crashes in BaseTextEditorWidget::viewportEvent

Something broke QtC today. Before lunch it worked
like before, but when i got back it started crashing.
Luckily i was able to reproduce it and caught a stack trace.

I have no clue what might be causing this.

When started, open recent session. Then start selecting some text with mouse, QtC crashes.

(gdb) bt full
#0 0xb785ccb8 in QTextEngine::positionInLigature(QScriptItem const*, int, QFixed, QFixed, int, bool) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#1 0xb78638ea in QTextLine::xToCursor(double, QTextLine::CursorPosition) const ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#2 0xb7afff6e in QPlainTextEditControl::hitTest(QPointF const&, Qt::HitTestAccuracy) const ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#3 0xb784c556 in QTextControlPrivate::mouseMoveEvent(QEvent*, Qt::MouseButton, QPointF const&, QFlags<Qt::KeyboardModifier>, QFlags<Qt::MouseButton>, QPoint const&) () from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#4 0xb7851f10 in QTextControl::processEvent(QEvent*, QMatrix const&, QWidget*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#5 0xb7843f8d in QTextControl::processEvent(QEvent*, QPointF const&, QWidget*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#6 0xb7b061c9 in QPlainTextEdit::mouseMoveEvent(QMouseEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#7 0xb21d17ff in TextEditor::BaseTextEditorWidget::mouseMoveEvent(QMouseEvent*) ()
from /home/vranki/QtSDK/QtCreator/lib/qtcreator/plugins/Nokia/libTextEditor.so
No symbol table info available.
#8 0xb75fd505 in QWidget::event(QEvent*) () from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#9 0xb7a498c3 in QFrame::event(QEvent*) () from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#10 0xb7adf192 in QAbstractScrollArea::viewportEvent(QEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#11 0xb21d07ba in TextEditor::BaseTextEditorWidget::viewportEvent(QEvent*) ()
from /home/vranki/QtSDK/QtCreator/lib/qtcreator/plugins/Nokia/libTextEditor.so
No symbol table info available.
#12 0xb7ae15c5 in QAbstractScrollAreaFilter::eventFilter(QObject*, QEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#13 0xb717bba1 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtCore.so.4
No symbol table info available.
#14 0xb759c263 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#15 0xb75a4aef in QApplication::notify(QObject*, QEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#16 0xb717b90b in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtCore.so.4
No symbol table info available.
#17 0xb759f132 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#18 0xb762b5e5 in QETWidget::translateMouseEvent(_XEvent const*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#19 0xb762ac56 in QApplication::x11ProcessEvent(_XEvent*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#20 0xb7657ea4 in x11EventSourceDispatch(_GSource*, int (void*), void*) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#21 0xb6c1fd86 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#22 0xb6c20125 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#23 0xb6c20201 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#24 0xb71aa8f1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtCore.so.4
No symbol table info available.
#25 0xb76579f5 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#26 0xb717aaed in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtCore.so.4
No symbol table info available.
#27 0xb717ad7a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtCore.so.4
No symbol table info available.
#28 0xb717c821 in QCoreApplication::exec() () from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtCore.so.4
No symbol table info available.
#29 0xb759bb77 in QApplication::exec() () from /home/vranki/QtSDK/QtCreator/bin/../lib/qtcreator/libQtGui.so.4
No symbol table info available.
#30 0x08051be0 in ?? ()
No symbol table info available.
#31 0xb6cfd4d3 in __libc_start_main (main=0x804f760, argc=1, ubp_av=0xbffff2f4, init=0x8053bc0, fini=0x8053bb0,
rtld_fini=0xb7fed270 <_dl_fini>, stack_end=0xbffff2ec) at libc-start.c:226
result = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {-1226289164, 0, 0, 0, -1168321288, -636407574},
mask_was_saved = 0}}, priv = {pad =

{0x0, 0x0, 0x1, 0x804cf30}

, data =

{prev = 0x0, cleanup = 0x0, canceltype = 1}

}}
not_first_call = <optimized out>
#32 0x0804cf51 in ?? ()
No symbol table info available.