[IDEA] shrink xrender featureset

[Clemens Eisserer]

> Out of interest - how widely are gradients used?  How often will a
> typical desktop use gradients?
At least when looking at all the GTK themes, gradients are used a lot.
I don't know wether QT4 uses RENDER gradients, but theme designers
there too seem to make heavy use of gradients.

Even Java's default theme uses gradients a lot:
http://java.sun.com/developer/technicalArticles/tools/nb_guibuilder/netbeans5_5.jpg
When looking sysprof profiles, I clearly see a lot of time is spent
for gradients - and at least on i915, almost all migration done is
caused by them.

- Clemens