krusader editor (F4) hangs in search field

[LimCore]

ii krusader 2.0~svn6078-1ubuntu1
ubuntu 8.10 amd64e

I'm editing an .sql file with default F4 editor and then using search (ctrl+f) and then always this happens after I ener few characters:

it hangs, (high cpu use) and:

(gdb) bt
#0 0x00007fee0b88049f in QTextEngine::format () from /usr/lib/libQtGui.so.4
#1 0x00007fee0b880a88 in QTextEngine::font () from /usr/lib/libQtGui.so.4
#2 0x00007fee0b881749 in QTextEngine::shapeTextWithHarfbuzz () from /usr/lib/libQtGui.so.4
#3 0x00007fee0b882ab8 in QTextEngine::shapeText () from /usr/lib/libQtGui.so.4
#4 0x00007fee0b882e25 in QTextEngine::shape () from /usr/lib/libQtGui.so.4
#5 0x00007fee0b88bd8c in QTextLine::layout_helper () from /usr/lib/libQtGui.so.4
#6 0x00007fedec7abbf5 in ?? () from /usr/lib/kde4/katepart.so
#7 0x00007fedec7b209d in ?? () from /usr/lib/kde4/katepart.so
#8 0x00007fedec8043e4 in ?? () from /usr/lib/kde4/katepart.so
#9 0x00007fedec8069c6 in ?? () from /usr/lib/kde4/katepart.so
#10 0x00007fedec807073 in ?? () from /usr/lib/kde4/katepart.so
#11 0x00007fedec7f2d1e in ?? () from /usr/lib/kde4/katepart.so
#12 0x00007fedec8196be in ?? () from /usr/lib/kde4/katepart.so
#13 0x00007fedec81c6ec in ?? () from /usr/lib/kde4/katepart.so
#14 0x00007fedec82236e in ?? () from /usr/lib/kde4/katepart.so
#15 0x00007fee0c3ff134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0x00007fee0b9fa6b2 in QLineEdit::textChanged () from /usr/lib/libQtGui.so.4
#17 0x00007fee0b9ffff9 in ?? () from /usr/lib/libQtGui.so.4
#18 0x00007fee0ba02571 in QLineEdit::keyPressEvent () from /usr/lib/libQtGui.so.4
#19 0x00007fee0b6ef1e8 in QWidget::event () from /usr/lib/libQtGui.so.4
#20 0x00007fee0ba003db in QLineEdit::event () from /usr/lib/libQtGui.so.4
#21 0x00007fee0b69cc3d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0x00007fee0b6a5864 in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0x00007fee0d57313b in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0x00007fee0c3ead61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0x00007fee0b72b5c4 in ?? () from /usr/lib/libQtGui.so.4
#26 0x00007fee0b72d8a7 in ?? () from /usr/lib/libQtGui.so.4
#27 0x00007fee0b707390 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#28 0x00007fee0b72f2c4 in ?? () from /usr/lib/libQtGui.so.4
#29 0x00007fee0778ed5b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007fee0779252d in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007fee077926eb in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007fee0c41315f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#33 0x00007fee0b72ea6f in ?? () from /usr/lib/libQtGui.so.4
#34 0x00007fee0c3e9682 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#35 0x00007fee0c3e980d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#36 0x00007fee0c3ebcbd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#37 0x0000000000458c51 in main (argc=5, argv=0x7fff16209dd8) at /build/buildd/krusader-2.0~svn6078/krusader/main.cpp:264