GNU bug report logs - #28854
line-number-display-width erroneously returns 0 when ...

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Keith David Bershatsky <esq <at> lawlist.com>
Subject: bug#28854: closed (Re: bug#28854: line-number-display-width
 erroneously returns 0 when ...)
Date: Mon, 16 Oct 2017 15:55:04 +0000

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Your bug report

#28854: line-number-display-width erroneously returns 0 when ...

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 28854 <at> debbugs.gnu.org.

-- 
28854: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28854
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Keith David Bershatsky <esq <at> lawlist.com>
Cc: 28854-done <at> debbugs.gnu.org
Subject: Re: bug#28854: line-number-display-width erroneously returns 0 when
 ...
Date: Mon, 16 Oct 2017 18:53:44 +0300

> Date: Sun, 15 Oct 2017 16:31:03 -0700
> From: Keith David Bershatsky <esq <at> lawlist.com>
> 
> line-number-display-width erroneously returns 0 when at the end of a very long line and `truncate-lines` is non-nil.

More accurately, when the first line visible in the window is
completely hscrolled out of view.

> STEP #1:  Launch a current version of the master branch without any user configuration; i.e., emacs -q.
> 
> STEP #2:  (setq truncate-lines t)
> 
> STEP #3:  (display-line-numbers-mode 1)
> 
> STEP #4:  Create a long line that is about 3 times the width of the window.  With point at the end of that line, evaluate:
> 
> (line-number-display-width 'pixelwise)
> 
> The result returned is 0, which is incorrect.

Thanks, fixed on the release branch.

[Message part 3 (message/rfc822, inline)]

From: Keith David Bershatsky <esq <at> lawlist.com>
To: Emacs Bug Reports <bug-gnu-emacs <at> gnu.org>
Subject: line-number-display-width erroneously returns 0 when ...
Date: Sun, 15 Oct 2017 16:31:03 -0700

line-number-display-width erroneously returns 0 when at the end of a very long line and `truncate-lines` is non-nil.

STEP #1:  Launch a current version of the master branch without any user configuration; i.e., emacs -q.

STEP #2:  (setq truncate-lines t)

STEP #3:  (display-line-numbers-mode 1)

STEP #4:  Create a long line that is about 3 times the width of the window.  With point at the end of that line, evaluate:

(line-number-display-width 'pixelwise)

The result returned is 0, which is incorrect.

BACKGROUND:  I am working on developing crosshairs as part of feature requests #17684 and #22873, and I need the line number display width (pixelwise) to accurately calculate when the horizontal ruler should begin to draw -- i.e., it.current_x + lnum_pixel_width = start drawing ...  I am also enabling compatibility with the fnctions scroll-right and scroll-left, and when horizontal scrolling the current line.

Thanks,

Keith

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