mintty focus problem after Windows 11 Insider Preview update

[Bruce Jerrick]

A heads-up warning for those using Windows Insider Preview
(bleeding-edge updates):

After installing Windows 11 Insider Preview "Cumulative Update
(10.0.22635.4005) (KB5040555)", there was a problem with the focus of
a mintty window: clicking once on its title bar removed focus.  And
that precluded moving the window on the desktop by double-clicking,
since the first click removed focus.

Behavior was back to nornal after reverting that Windoze update.  So
I don't consider this a problem with mintty, but rather with Microsoft.