Date: Thu, 24 Aug 2023 04:54:44 +0300
Cc:63896@debbugs.gnu.org
From: Dmitry Gutov<dmitry@gutov.dev>
On 05/06/2023 14:23, Eli Zaretskii wrote:
+ (format-mode-line mode-line-process nil nil buf)))
Do you really need to call format-mode-line? My advice is to stay
away of that function: it could have unpleasant side effects.
Does calling format-mode-line trigger extra redisplays or something?
That sounds unexpected.
It reuses parts of the redisplay's code, yes. Depending what's in the
format variable passed to format-mode-line, that could cause a variety
of surprises, especially if :eval forms are involved. It could also
temporarily select another window and/or buffer, if the respective
arguments are not omitted, which could also be unexpected.
IMO, this function should be used sparing and with caution.