Emacs does not listen on w32

[Lennart Borgman (gmail)]

I made a mistake when essentially changed the fontify-region-function I 
used. This lead to Emacs looping updating the echo area with new 
messages (trace messages), but not listening even to the OS events. I 
clicked the upper right X to try to close Emacs, but nothing happened.

I even had to shut off the pc power since I could not get the Windows 
Task Manager to come up.

It looks to me there must be two bugs here:

- Emacs not giving up cpu to windows.
- Emacs is not listening to OS events when it executes lisp code.