[debbugs-tracker] bug#28854: closed (line-number-display-width erroneously returns 0 when ...)

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Your message dated Mon, 16 Oct 2017 18:53:44 +0300
with message-id <address@hidden>
and subject line Re: bug#28854: line-number-display-width erroneously returns 0 
when ...
has caused the debbugs.gnu.org bug report #28854,
regarding line-number-display-width erroneously returns 0 when ...
to be marked as done.

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28854: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28854
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> --- Begin Message ---
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> Subject: 
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> line-number-display-width erroneously returns 0 when ...
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> Date: 
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> Sun, 15 Oct 2017 16:31:03 -0700
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> 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
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> 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 <address@hidden>
> > 
> > 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.
>
>
> --- End Message ---