Artifacts when long text is placed in left-side toolbar

[Dmitry Shachnev]

When a window has toolbar on the left (Qt.LeftToolBarArea) with wide text on it, toolbar gets colored vertical lines. This happens only when the window has big height (>=741 or me).
I attach simple 20-lines Python script that reproduces it and screenshot.

Qt bug: http://bugreports.qt.nokia.com/browse/QTBUG-18806.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Graphics: Intel GMA 450
Package: libqtgui4
ProcVersionSignature: Ubuntu 2.6.35-23.41-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic i686
Architecture: i386
Date: Mon Dec 6 18:23:58 2010
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
ProcEnviron:
 LANG=ru_RU.utf8
 SHELL=/bin/bash
SourcePackage: qt4-x11

[Dmitry Shachnev (mitya57)]

I can't assign it to this URL, so I'll leave it here:
http://bugreports.qt.nokia.com/browse/QTBUG-18806