I made some modifications to the icewm native decoration concerning the corners of the window: I noticed that icewm themes that have round shaped pixmaps for the corners are often drawn with some artefacts at the corners because the background is not clipped. This enhanced version does this explicitly so no artefacts are there anymore. If you have an icewm theme that wants to use this new feature you just have to add the following extra option inside the corresponding default.theme file:
RoundCorners=1 (1 means Active and 0 means inactive, which is the default)
The enhanced_icewm.tar.gz file that I uploaded must be extracted inside the kwin/clients/icewm directory of a standard kdebase-3.0.x OR kdebase-3.1 source tree and can thus be built with the standard built environment of kdebase.
Screenshot one shows the enhanced icewm in action: Notice the corners without artefacts compared to the second screenshot that shows the standard icewm typical artefacts.
THE SCREENSHOTS ARE JUST ONE EXAMPLE OF AN ICEWM THEME USING THE ROUND CORNERS.