GNU bug report logs - #56682
Fix the long lines font locking related slowdowns

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From: Eli Zaretskii <eliz <at> gnu.org>
To: gregory <at> heytings.org
Cc: 56682 <at> debbugs.gnu.org
Subject: bug#56682: Fix the long lines font locking related slowdowns
Date: Fri, 22 Jul 2022 22:25:20 +0300

> Cc: 56682 <at> debbugs.gnu.org
> Date: Fri, 22 Jul 2022 18:06:44 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > The assertion below can now be violated:
> > 
> >       if (it->narrowed_begv)
> > 	{
> > 	  record_unwind_protect (unwind_narrowed_begv, Fpoint_min ());
> > 	  record_unwind_protect (unwind_narrowed_zv, Fpoint_max ());
> > 	  SET_BUF_BEGV (current_buffer, it->narrowed_begv);
> > 	  SET_BUF_ZV (current_buffer, it->narrowed_zv);
> > 	  specbind (Qinhibit_widen, Qt);
> > 	}
> > 
> >       val = Vfontification_functions;
> >       specbind (Qfontification_functions, Qnil);
> > 
> >       eassert (it->end_charpos == ZV);  <<<<<<<<<<<<<<<<<
> > 
> > because of the "narrowing".  (I actually saw this assertion violation
> > once on the branch, but I cannot reproduce it.)
> 
> Sorry, it's very easy to reproduce: visit dictionary.josn, and then
> type C-v several times until it happens.

I installed a fix.

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