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

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: yantar92@gmail.com,  57207@debbugs.gnu.org
> Date: Wed, 17 Aug 2022 12:42:24 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> 1) In an HTML buffer with huge <img src="base64:data...."> JPEGs hidden
> >> under display properties (we're talking multi-megabyte lines -- but
> >> hidden), I've seen some odd point movements around these images -- like
> >> the cursor gets stuck at the edges of that line.  But only sometimes.
> >
> > Can you show an example of such a file, or tell where can one download
> > it?
> 
> Sorry, no -- like I said, I can't reproduce it reliably.

Well, next time it happens, would you please note the file/URL and
post it?

> >> 2) My *Messages* buffer frequently ends up being narrowed, and that
> >> didn't happen before.  Is that something that can happen somehow?
> >
> > If it does, it could be that we don't undo the narrowing in some
> > situations?
> 
> It sounds like it, but is that even possible?

Bugs are strange things, yes.