Thanks, Kevin.  That works perfectly.

I pushed a small adjustment to the unixWm tests which makes a bunch more pass.
The tests were deiconifying a window and then checking its geometry.  But on
the mac the deiconification involves a very slow animation.  The tests need
to wait for that to finish before checking the geometry.

As far as I can tell, the bugfix branch is ready to be merged.  Please confirm!
If there are no further issues I will merge it on Monday.