GNU bug report logs - #64596
30.0.50; On FIXME: in src/buffer.c:1481 (force-mode-line-update)

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: yantar92 <at> posteo.net, 64596 <at> debbugs.gnu.org
Subject: bug#64596: 30.0.50; On FIXME: in src/buffer.c:1481 (force-mode-line-update)
Date: Sun, 16 Jul 2023 10:49:16 -0400

> So it sounds like we should make sure we don't set the frame's
> redisplay flag unless most or all of its windows actually need to be
> considered.  Is this so with the current code?

Indeed, the frame's `redisplay` bit means "*all* windows in that frame
need to be redisplayed", so it should be set with care.  But since the
code before that only had a single boolean for "redisplay all windows on
all frames", I was often happy enough to replace the global redisplay with
`fset_redisplay` even though it might be possible to be more specific.

`fset_redisplay` is typically used when windows are added/deleted/resized,
because it's hard at that point to know which windows really need to
be updated.


        Stefan

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