[xmonad] Floats always go to the current screen (Patch)

[Don Stewart]

Applied, let's see if anyone notices.

robreim:
> I think the attached patch should provide the functionality of the 
> original patch without the bugs. Perhaps someone who saw the bugs in the 
> last patch could test to confirm that they don't exist in this one.
> 
> Thanks
> 
> 
> Don Stewart wrote:
> >Oh, I thought we talked about this? Hmm -- you should hang out on the
> >irc channel :)
> >
> >There were a number of issues, but the main thing is that moving clients
> >from one screen to another no longer caused the window to attach to the
> >new screen.
> >
> >Instead, the window would wobble and get dragged back to the first
> >workspace. So while I liked the general idea, we need to tweak it so
> >that you can still move clients to new screens -- it should just be
> >popup windows that get constrained to the current screen.
> >
> >See these bug reports filed after we first applied the patch,
> >
> >    http://code.google.com/p/xmonad/issues/detail?id=159
> >    http://code.google.com/p/xmonad/issues/detail?id=160
> >    http://code.google.com/p/xmonad/issues/detail?id=161
> >
> >which were fixed when reverting it.
> >