bug#56683: 29.0.50; long lines fix doesn't work correctly when lines are truncated

[Eli Zaretskii]

> Date: Tue, 26 Jul 2022 07:32:55 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Eli Zaretskii <eliz@gnu.org>, 
>     Gerd Möllmann <gerd.moellmann@gmail.com>, 
>     56683@debbugs.gnu.org
> 
> (A side note: if you rarely scroll to the right that much, you can also 
> truncate the lines with an external tool like "cut", either before you 
> open the file in Emacs, or inside Emacs with C-x h M-| cut -c-1000 RET.)

If you never scroll such windows too much to the right, the problems
with "finite infinity" won't show at all, AFAICT, so there's no need
to use 'cut' or its ilk.