Version: (using KDE KDE 3.5.6) Installed from: Gentoo Packages Libraries versions: qt-3.3.8-r2 kdelibs-3.5.6-r7 gtk-engines-qt-0.7_p20070327-r2 That only happens in buttons with a black arrow in right-down corner (the dropdown list) -- the rectangle doesn't include this arrow.
Created attachment 20434 [details] The screenshot of problem
kdelibs-3.5.7-r2 already, qt-3.3.8-r3 The bug still exists
fixed with Qt 4.x (tested Kmail toolbar buttons from KDE 4.1.0)