bug#64846: Emacs 29 RC on Windows: White background color flashes on startup, before background color from config takes effect on Windows

[Eli Zaretskii]

> From: Yanchi Tóth <yanchi.toth@gmail.com>
> Date: Tue, 25 Jul 2023 15:32:33 +0200
> Cc: 64846@debbugs.gnu.org
> 
> I managed to reproduce with this fairly minimal configuration:
> 
> (set-background-color "#191919")
> (set-foreground-color "burlywood")
> 
> Because the config is much smaller, the flash of white is much shorter, but 
> still noticeable.

Instead of the above, try adding to your early-init file the
following:

  (add-to-list 'default-frame-alist
               '(background-color . "#191919")
               '(foreground-color . "burlywood"))