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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fill column indicator functionality
Date: Tue, 05 Feb 2019 18:41:44 +0200
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To: Ergus <spacibba@aol.com>
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> Date: Tue, 5 Feb 2019 11:53:40 +0100
> From: Ergus <spacibba@aol.com>
> 
> I can't find any fill column indication functionality in emacs. For 80
> (or 120) sacred column rule.

ruler-mode does it, but maybe you are looking for a different kind of
indicator.  If so, would you like to describe how you'd like it to
look?

> Is it too difficult to add such a functionality native in emacs as you
> did with the line numbers in the last release?

Hard to answer this without knowing what functionality is being
sought.