GNU bug report logs - #61580
line-prefix and display text properties cause odd cursor movement

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Darius Foo <darius.foo.tw <at> gmail.com>
Subject: bug#61580: closed (Re: bug#61580: line-prefix and display text
 properties cause odd cursor movement)
Date: Thu, 02 Mar 2023 10:32:02 +0000

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Your bug report

#61580: line-prefix and display text properties cause odd cursor movement

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 61580 <at> debbugs.gnu.org.

-- 
61580: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=61580
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: darius.foo.tw <at> gmail.com
Cc: 61580-done <at> debbugs.gnu.org
Subject: Re: bug#61580: line-prefix and display text properties cause odd
 cursor movement
Date: Thu, 02 Mar 2023 12:31:26 +0200

> Cc: 61580 <at> debbugs.gnu.org
> Date: Sat, 18 Feb 2023 13:42:31 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: Darius Foo <darius.foo.tw <at> gmail.com>
> > Date: Sat, 18 Feb 2023 00:39:00 +0800
> > 
> > When moving the cursor up and down on lines which have both line-prefix and display text properties, the
> > cursor column isn't preserved, jumping ahead or back by a fixed amount.
> > 
> > This can be reproduced with the following config
> > 
> >       (add-text-properties 12 13 '(line-prefix "  "))
> >       (add-text-properties 27 28 '(line-prefix "  "))
> >       (add-text-properties 57 58 '(line-prefix "    "))
> >       (add-text-properties 72 73 '(line-prefix "    "))
> > 
> >       (add-text-properties 12 13 '(display "•"))
> >       (add-text-properties 27 28 '(display "•"))
> >       (add-text-properties 57 58 '(display "•"))
> >       (add-text-properties 72 73 '(display "•"))
> > 
> > and this input file (which mimics org-indent).
> > 
> >     * h1
> >     ** h2
> >     - a.y.........
> >     - x...........
> >     *** h3
> >     **** h4
> >     - ....w.......
> >     - z...........
> > 
> > With the cursor on x, pressing up moves it to y instead of a, and pressing down moves it back to x. The
> > amount moved depends on the indentation added by line-prefix: with the cursor on z, pressing up moves it to
> > w.
> 
> Thanks, should be fixed now on the emacs-29 branch.
> 
> (This bug was a leftover from incomplete fix of bug#49695.)

No further comments, so I'm now closing this bug as fixed.

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From: Darius Foo <darius.foo.tw <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: line-prefix and display text properties cause odd cursor movement
Date: Sat, 18 Feb 2023 00:39:00 +0800

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When moving the cursor up and down on lines which have both line-prefix and
display text properties, the cursor column isn't preserved, jumping ahead
or back by a fixed amount.

This can be reproduced with the following config

      (add-text-properties 12 13 '(line-prefix "  "))
      (add-text-properties 27 28 '(line-prefix "  "))
      (add-text-properties 57 58 '(line-prefix "    "))
      (add-text-properties 72 73 '(line-prefix "    "))

      (add-text-properties 12 13 '(display "•"))
      (add-text-properties 27 28 '(display "•"))
      (add-text-properties 57 58 '(display "•"))
      (add-text-properties 72 73 '(display "•"))

and this input file (which mimics org-indent).

    * h1
    ** h2
    - a.y.........
    - x...........
    *** h3
    **** h4
    - ....w.......
    - z...........

With the cursor on x, pressing up moves it to y instead of a, and pressing
down moves it back to x. The amount moved depends on the indentation added
by line-prefix: with the cursor on z, pressing up moves it to w.

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