Re: MS Windows double buffering

[Eli Zaretskii]

> Date: Sat, 30 Apr 2022 13:34:32 -0400
> Cc: emacs-devel@gnu.org
> From: Ken Brown <kbrown@cornell.edu>
> 
> On 4/30/2022 2:50 AM, Eli Zaretskii wrote:
> >   . w32term.c is also used in the Cygwin w32 build, (which produces a
> >     Cygwin Emacs that uses the native MS-Windows GUI functions instead
> >     of X).  Will this code work in that build?  If not, the new code
> >     should be ifdef'ed away on Cygwin.  Ken, can you please chime in
> >     and help us DTRT here?
> 
> I just built the Cygwin w32 build from git commit 0ea0aa255 and evaluated
> 
>    (while t (redraw-display) (redisplay))
> 
> I saw some flicker in the menu bar but nowhere else.  I tried the same thing 
> in 
> a Cygwin w32 build of emacs-28.1, and there was severe flickering throughout 
> the 
> frame.  So there's a noticeable improvement.
> 
> I'll keep testing over the next few days and let you know if I see any 
> problems.

Great, thanks.  It means most if not all of the new code works for the
Cygwin w32 build as-is.