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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fill column indicator functionality
Date: Fri, 15 Mar 2019 20:21:05 +0200
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To: Drew Adams <drew.adams@oracle.com>
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> Date: Fri, 15 Mar 2019 16:59:16 +0000 (UTC)
> From: Drew Adams <drew.adams@oracle.com>
> Cc: esq@lawlist.com
> 
> Keith is apparently working on such a thing for a
> fake-cursors implementation.  And this thread is
> about using such a thing for indicating the fill
> column.
> 
> Do I understand that right?  If so, will the approach
> to doing this be general, so the same implementation
> (in C) can be used for both of these applications?

Asked and answered:

  http://lists.gnu.org/archive/html/emacs-devel/2019-03/msg00356.html