GNU bug report logs - #29597
26.0.90; line-number-display-width returns incorrect width

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Message #36 received at 29597 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Paul Rankin <hello <at> paulwrankin.com>, 29597 <at> debbugs.gnu.org
Subject: Re: bug#29597: 26.0.90;
 line-number-display-width returns incorrect width
Date: Fri, 8 Dec 2017 10:37:09 -0500

On Fri, Dec 8, 2017 at 10:01 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:

>> I understand that this function is also used internally for specific purposes, so it needs to behave a specific way to appease the initial writer of the code. But for the sake of sanity, I strongly suggest either fixing this function or creating a separate “public” function that operates vaguely in line with user expectation for those of us wanting to accommodate display-line-numbers-mode.
>
> Sorry, I don't understand what is missing.  If you wanted the value of
> 4 in your case, you need to call this function like this:
>
>   (line-number-display-width 'columns)
>
> as documented.

I think the idea would to split that function into 2 simpler ones, e.g.:

(line-number-display-columns) => 4
(line-number-display-width) => 2
(line-number-display-width t) => the equivalent in pixels

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