Version:           unspecified (using KDE 4.7.3) 
OS:                Linux

Qt 4.7.4
KDE 4.8 beta 1 (Chakra Package).

GDB Backtrace Thread #1:
#0  0x00007f6f09f71ae5 in QApplication::compressEvent(QEvent*, QObject*, QPostEventList*) () from /usr/lib/libQtGui.so.4
#1  0x00007f6f0ad95b85 in QCoreApplication::postEvent(QObject*, QEvent*, int) () from /usr/lib/libQtCore.so.4
#2  0x00007f6f09fc64f0 in QWidget::setVisible(bool) () from /usr/lib/libQtGui.so.4
#3  0x00007f6efd7371b7 in KPluginSelector::Private::PluginDelegate::updateItemWidgets(QList<QWidget*>, QStyleOptionViewItem const&, QPersistentModelIndex const&) const () from /usr/lib/libkcmutils.so.4
#4  0x00007f6f0bb2f35f in ?? () from /usr/lib/libkdeui.so.5
#5  0x00007f6f0bb2d7d9 in ?? () from /usr/lib/libkdeui.so.5
#6  0x00007f6f0bb2d968 in ?? () from /usr/lib/libkdeui.so.5
#7  0x00007f6f0ada8aae in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#8  0x00007f6f09f71d94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9  0x00007f6f09f76c01 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x00007f6f0bb4ee26 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#11 0x00007f6f0ad922fc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#12 0x00007f6f0ad9566f in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /usr/lib/libQtCore.so.4
#13 0x00007f6f0adbcab3 in ?? () from /usr/lib/libQtCore.so.4
#14 0x00007f6f068386d3 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#15 0x00007f6f06838eb0 in ?? () from /usr/lib/libglib-2.0.so.0
#16 0x00007f6f0683914d in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#17 0x00007f6f0adbcf16 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQtCore.so.4
#18 0x00007f6f0a014cae in ?? () from /usr/lib/libQtGui.so.4
#19 0x00007f6f0ad914f2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQtCore.so.4
#20 0x00007f6f0ad916f7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#21 0x00007f6f0ad958eb in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#22 0x00007f6ef783569f in kdemain () from /usr/lib/libkdeinit4_krunner.so
#23 0x0000000000408792 in _start ()

Reproducible: Always

Steps to Reproduce:
1. Click on krunner configure button

Actual Results:  
work well.

Expected Results:  
krunner freeze and took 100% cpu.