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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Line height issues with display-line-number-mode
Date: Wed, 08 May 2019 17:07:49 +0300
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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In-reply-to: <jwv5zqlvzso.fsf-monnier+emacs@gnu.org> (message from Stefan
	Monnier on Wed, 08 May 2019 09:40:22 -0400)
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> X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_40,RCVD_IN_DNSWL_MED
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> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Cc: Ergus <spacibba@aol.com>, emacs-devel@gnu.org
> Date: Wed, 08 May 2019 09:40:22 -0400
> 
> > The fill-column indicator is not displayed in lines that extend poast
> > the fill-column, so this problem doesn't happen there, or at least not
> > in the popular scenarios (including both scenarios described in this
> > thread).
> 
> At least for the *vc-log* case, the thin-separator-line is actually an
> empty line

This is a misunderstanding of what "extend" means, in this context.
It means we have glyphs there.  And we must, when the background is
not the default one.