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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [PATCH] Display fill column indicator issue.
Date: Fri, 04 Jun 2021 13:46:03 +0300
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To: Ergus <spacibba@aol.com>
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> Date: Fri, 4 Jun 2021 12:38:46 +0200
> From: Ergus <spacibba@aol.com>
> Cc: emacs-devel@gnu.org
> 
> >AFAICT, this never worked correctly on TTY frames.
> 
> Hi Eli:
> 
> If I have time I will try to bisect this, but it worked fine some time
> (not very long) ago.
> 
> I know it because I only use tty and need this feature very often; and I
> know I have check my lines length with it more than once. Specially when
> using my laptop that has a small screen.

All I know is that the same problem exists in Emacs 27.2, at least in
"emacs -Q -nw".  So if this is a regression, it is a very old one.