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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Native line numbers landed on master
Date: Mon, 10 Jun 2019 20:41:18 +0300
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To: Yuri D'Elia <wavexx@thregr.org>
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> From: Yuri D'Elia <wavexx@thregr.org>
> Cc: lekktu@gmail.com, emacs-devel@gnu.org
> Date: Mon, 10 Jun 2019 18:23:24 +0200
> 
> What I meant really is just specific face properties to avoid the need
> to recalculate widths, but now that I check, we already allow to
> "line-number-current-line-face" to be a different face entirely.

Right.  So we could use something similar for lines whose numbers are
integral multiples of N, for some N.  I think a limited number of
specific features like that is better than a total freedom via a
function call.