GNU bug report logs - #17823
24.3.91; end-of-visual-line: incorrect behaviour with truncate-lines and a line-prefix

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
Subject: bug#17823: closed (Re: bug#17823: 24.3.91; end-of-visual-line:
 incorrect behaviour with truncate-lines and	a	line-prefix)
Date: Sat, 21 Jun 2014 12:38:04 +0000

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Your bug report

#17823: 24.3.91; end-of-visual-line: incorrect behaviour with truncate-lines and a line-prefix

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 17823 <at> debbugs.gnu.org.

-- 
17823: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17823
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: theonewiththeevillook <at> yahoo.fr
Cc: 17823-done <at> debbugs.gnu.org
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

> Date: Fri, 20 Jun 2014 21:56:22 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 17823 <at> debbugs.gnu.org
> 
> > From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
> > 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.

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From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.91;
 end-of-visual-line: incorrect behaviour with truncate-lines and a
 line-prefix
Date: Fri, 20 Jun 2014 19:40:24 +0200

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.

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