i just wanted to state that even though window decorations do have a "hover" or "prelight" state now, this is only true for the window in focus and personally i can't see why this makes sense (unless adding a hover-state to inactive windows would bring dramatic performance problems).
quoting from the related (but fixed) previous bugreport (http://bugzilla.xfce.org/show_bug.cgi?id=3219):
This is a very pleasing cosmetic effect, and would be cool to have.
Steps to Reproduce:
1. Hover curser over window decoration button
Button pixmap should change
Well, Metacity (and surely others) implements this, and I don't like it much. Quite frankly I am not really interested in implementing that (though it is trivial, all the work would have to come from the theme designers).
that's a pity. is there any specific reason why you wouldn't like to see this in xfwm4?
(since it's really about whether the themes implement it in the end it wouldn't be too much of a loss, would it?)