bug#61580: closed (line-prefix and display text properties cause odd cursor movement)

[GNU bug Tracking System]

Your message dated Thu, 02 Mar 2023 12:31:26 +0200
with message-id <83jzzze96p.fsf@gnu.org>
and subject line Re: bug#61580: line-prefix and display text properties cause 
odd cursor movement
has caused the debbugs.gnu.org bug report #61580,
regarding line-prefix and display text properties cause odd cursor movement
to be marked as done.

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61580: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=61580
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--- Begin Message --- Subject: line-prefix and display text properties cause odd cursor movement 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.

--- End Message ---

> --- Begin Message ---
>
>
>
> 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@debbugs.gnu.org
> > Date: Sat, 18 Feb 2023 13:42:31 +0200
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > > From: Darius Foo <darius.foo.tw@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.
>
>
> --- End Message ---