[Xmonad] darcs patch: make delete work when window is in multiple workspaces.

This change makes delete work when a window is present in multiple workspaces. It also modifies filter to follow the same focus semantics as delete. This seems a good thing. We could debate this, if anyone cares, but filter is hardly used at all, and when it is, it makes sense for delete semantics to be followed. David Tue Jul 24 07:20:45 PDT 2007 David Roundy * make delete work when window is in multiple workspaces.