Update TODO: all the Xinerama issues I've encountered are fixed

As of:

Fri Apr 13 04:37:02 EDT 2007  Spencer Janssen <sjanssen@cse.unl.edu>
  * Ignore window entries while moving windows.  This should fix all the focus preservation problems.

TODO

@@ -10,15 +10,6 @@
   ignore EnterNotify events (by changing selectInput for the duration).
 - let mod+enter demote a master window
 
-- Xinerama bugs:
-    - Closing the last window in a workspace moves focus to another Xinerama
-      screen.
-    - Focus goes to other Xinerama screen when changing to empty window and
-      create new window.
-    - Focus doesn't always follow mouse or mouse click across Xinerama screens;
-      sometimes focus will only switch with key command to switch to that
-      screen.
-
 - think about the statusbar/multithreading.
     Three shared TVars:
         windowTitle :: TVar String