Subject: bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)

From: Lars Ingebrigtsen <[email-masked]>
Date: Sat, 20 Aug 2022 11:57:44 +0200

Eli Zaretskii <[email-masked]> writes:

>> Would binding `inhibit-redisplay' there help?
>
> Maybe it will, but how can we do that?  It would break any pre- and
> post-command hooks that do need to trigger redisplay.

Do they need to while in this hard-narrow mode?  Hm... probably.

I'm not quite understanding why we're narrowing here in the first place.
Point is not in a long line in this test case -- there's just a long
line (hidden under a display property) earlier in the buffer.