Re: MS Windows double buffering

[Ken Brown]

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.

Ken