[Xmonad] darcs patch: keep focus stack.

Hi all, Here's a cut at a focus stack. It's a bit crude, but seems to work. I had to tweak the rotate properties, since rotating the focus (obviously) changes the focus stack. I don't think this weakening of those checks is really a Bad Thing. And I'm a little puzzled how prop_delete_push ever passed. Maybe it failed, and noone noticed? Or maybe we aren't running enough tests with large enough stack sizes, so we never ran into the case where the focus wasn't on the master window to start with? I don't know, but it suggests something is wrong. David P.S. Sorry for my crude code. If we like this behavior, we can clean it up. Sat May 5 10:57:09 PDT 2007 David Roundy <droundy@darcs.net> * keep focus stack.