bug#57669: 29.0.50; C-n, C-p off under long lines

[Eli Zaretskii]

> Date: Fri, 09 Sep 2022 15:58:50 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: dick <dick.r.chiang@gmail.com>, 57669@debbugs.gnu.org
> 
> 
> >> Under long-line-threshold=10000 find-file 99s
> >
> > This means on average 1 sec per C-n.  Which is tolerable.
> >
> 
> The buffer contains ten lines each of which is 100K long, so C-n is called 
> much more than 100 times, it is called ~10000 times.  So that's actually 
> ~10 ms per C-n.

Even better.