[debbugs-tracker] bug#17823: closed (24.3.91; end-of-visual-line: incorrect behaviour with truncate-lines and a line-prefix)

[GNU bug Tracking System]

Your message dated Sat, 21 Jun 2014 15:36:52 +0300
with message-id <address@hidden>
and subject line Re: bug#17823: 24.3.91; end-of-visual-line: incorrect 
behaviour with truncate-lines and        a       line-prefix
has caused the debbugs.gnu.org bug report #17823,
regarding 24.3.91; end-of-visual-line: incorrect behaviour with truncate-lines 
and a line-prefix
to be marked as done.

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17823: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17823
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> --- Begin Message ---
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> Subject: 
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> 24.3.91; end-of-visual-line: incorrect behaviour with truncate-lines and a line-prefix
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> Date: 
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> Fri, 20 Jun 2014 19:40:24 +0200
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> Hi,
>
> from emacs -Q, run the following with M-:
>
> (progn
>   (insert (make-string 500 ?x))
>   (column-number-mode) ;; just to see it. plays no role.
>   (beginning-of-line)
>   (setq line-prefix (make-string 10 ? ))
>   (visual-line-mode)
>   (toggle-truncate-lines 1))
>
> then hit C-e (end-of-visual-line) a few times. After some hits, the
> cursor doesn't move anymore, although it's not at the end of the line.
> On my machine, it goes to column 70, then 100, then stops there even
> when hitting C-e again.
>
> I expect emacs to scroll horizontally instead (like it does when
> line-prefix is nil).
>
> -- 
> Nicolas.
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#17823: 24.3.91; end-of-visual-line: incorrect behaviour with truncate-lines and	a	line-prefix
>
>
>
>
> Date: 
>
> Sat, 21 Jun 2014 15:36:52 +0300
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>
>
>
> > Date: Fri, 20 Jun 2014 21:56:22 +0300
> > From: Eli Zaretskii <address@hidden>
> > Cc: address@hidden
> > 
> > > From: Nicolas Richard <address@hidden>
> > > Date: Fri, 20 Jun 2014 19:40:24 +0200
> > > 
> > > (progn
> > >   (insert (make-string 500 ?x))
> > >   (column-number-mode) ;; just to see it. plays no role.
> > >   (beginning-of-line)
> > >   (setq line-prefix (make-string 10 ? ))
> > >   (visual-line-mode)
> > >   (toggle-truncate-lines 1))
> > > 
> > > then hit C-e (end-of-visual-line) a few times. After some hits, the
> > > cursor doesn't move anymore, although it's not at the end of the line.
> > > On my machine, it goes to column 70, then 100, then stops there even
> > > when hitting C-e again.
> > > 
> > > I expect emacs to scroll horizontally instead
> > 
> > Why do you expect that?  "Visual line" means the line that is on
> > display.  What isn't on display does not exist for this purpose.
> > 
> > Is there some real-life use case behind this?  If so, please show it.
>
> Actually, no, don't bother.  I found out that this was due to the
> original code in vertical-motion being incorrect due to some subtle
> aspect of the display engine which the code ignored.
>
> Fixed in revision 117277 on the emacs-24 branch.
>
>
> --- End Message ---