Fix the damned enternotify code for real.

Fix the damned enternotify code for real.
Weed out VirtualNotify (switch ws and border crossings) and InferiorNotify
(focus on self, aka touching its own border).
Then check for ConfigureNotify to see if a window is being deleted or moved
to another work space.

This is the smaller hammer for the QLength trick that used to be in there.

If we still have focus issues we need to work those but this is worth
going in.