GNU bug report logs - #74281
30.0.91; font-lock mode hangs on scrolling large Scheme file

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From: Eli Zaretskii <eliz <at> gnu.org>
To: divya <at> subvertising.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 74281 <at> debbugs.gnu.org
Subject: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
Date: Sat, 04 Jan 2025 15:10:06 +0200

> Date: Thu, 02 Jan 2025 14:12:06 +0000
> From: divya--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Hello again Stefan and Happy GNU/Year.
> 
> > Hmm... on my tests, I can reproduce in `emacs-30` the very slow
> > font-locking you described when we're at the end of the buffer, but not
> > on `master`.  Just to confirm that you're running the "right" code, can
> > you do `M-: font-lock--syntax-table-affects-ppss RET` from within that
> > `tex.scm` buffer?  It should return nil if my fix was applied.  If it
> > returns t then you're presumably still using the old code (or there's
> > something else amiss).  If it returns something else than nil or t then
> > there's something else amiss.
> 
> I just checked and my compiled build was of an older commit. The 
> variable was set `t`. I built from the latest commit and indeed now I 
> can scroll flawlessly in the reported file.
> 
> > FWIW, even with the fix, Emacs is not quite able to keep up with `M-v`
> > with an auto-repeat of 40/s when done from the end of the buffer, but:
> > - When I release the key it catches up fairly quickly (hence the "not
> >   quite").  So I wouldn't describe it as "hangs".
> > - This is on my 16 years old 2.5GHz Core 2 Duo (Thinkpad T61).
> > - It's an Emacs compiled with `-Og` and with `--enable-checking`.
> 
> That's reasonable for the system. I do not notice any sort of lag with 
> `M-v` on my system (Ryzen 7 5700G).
> 
> Thank you Eli and Stefan for the prompt fix. Really admire the work you 
> guys do.

So should we now close this bug?

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