bug#61667: 29.0.60; Failure to redisplay

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Gregory Heytings <gregory@heytings.org>,  61667@debbugs.gnu.org,  Eli
>  Zaretskii <eliz@gnu.org>
> Date: Fri, 03 Mar 2023 08:54:43 +0800
> 
> Also, since we now know blink-cursor-mode was previously screwing with
> the results, would you please try some other window manager again and
> see if the problem reproduces without GNOME?

For a good measure, also disable global-eldoc-mode.  I've found long
ago that blink-cursor-mode and global-eldoc-mode get in the way of
debugging and testing various redisplay problems, because they tend to
trigger extra redisplay cycles.

For an even cleaner environment, I suggest to disable all the timers
that we run by default (see "M-x list-timers").  Timers change how our
main loop behaves, and the routine redisplay calls are part of the
main loop.