Version: (using KDE 4.2.1) Installed from: SuSE RPMs Oxygen has rendering issues in qtwebkit with line edits and buttons. In Konqueror with webkit and in Arora, line edits are rendered too small to fit text in them and buttons as well, also there are some issues with check boxes (for e.g. in gmail) For more details and other bugs see: http://code.google.com/p/arora/wiki/KDE4Integration
Created attachment 32265 [details] Screenshot
Well then please report the bug to qtwebkit Oxygen style has the size you set it, and if you use sizehint or sizeFromContents you get appropriately sized widgets.
Sorry, I thought it's oxygen related issue and it seams I was wrong. I'll report it to qtwebkit guys.