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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: How to get the line offset in `display-line-numbers-mode'?
Date: Fri, 31 Jan 2020 21:29:02 +0200
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> From: Mattias Engdegård <mattiase@acm.org>
> Date: Fri, 31 Jan 2020 19:44:59 +0100
> Cc: emacs-devel@gnu.org
> 
> 31 jan. 2020 kl. 19.14 skrev Bastien <bzg@gnu.org>:
> 
> > Assuming display-line-numbers-mode is turned on, how can I get
> > the number of spaces this mode uses for displaying numbers?
> 
> It may not be the right way, but I ended up using
> 
>  (round (line-number-display-width 'columns))

That's the right way.