Free as in free speech

I have had some hack at Oxygen style. This all was for allowing Oxygen draw custom categories at KListView. My proposal is this one:

Of course, here you can find the patches for kdelibs, and for oxygen style.

I removed some hard coded values that had the previous version and that were just for testing reasons. I still need to handle properly the sizeFromContents method.

If you have any comments or suggestions feel free to contact me.