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

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Package: emacs;

Reported by: Darius Foo <darius.foo.tw <at> gmail.com>

Date: Fri, 17 Feb 2023 17:15:01 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#61580; Package emacs. (Fri, 17 Feb 2023 17:15:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Darius Foo <darius.foo.tw <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Fri, 17 Feb 2023 17:15:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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
[Message part 1 (text/plain, inline)]
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.
[Message part 2 (text/html, inline)]

Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#61580; Package emacs. (Sat, 18 Feb 2023 11:43:01 GMT) Full text and rfc822 format available.

Message #8 received at 61580 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Darius Foo <darius.foo.tw <at> gmail.com>
Cc: 61580 <at> debbugs.gnu.org
Subject: Re: bug#61580: line-prefix and display text properties cause odd
 cursor movement
Date: Sat, 18 Feb 2023 13:42:31 +0200
> 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.)




Reply sent to Eli Zaretskii <eliz <at> gnu.org>:
You have taken responsibility. (Thu, 02 Mar 2023 10:32:02 GMT) Full text and rfc822 format available.

Notification sent to Darius Foo <darius.foo.tw <at> gmail.com>:
bug acknowledged by developer. (Thu, 02 Mar 2023 10:32:02 GMT) Full text and rfc822 format available.

Message #13 received at 61580-done <at> debbugs.gnu.org (full text, mbox):

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.




Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#61580; Package emacs. (Fri, 03 Mar 2023 04:41:02 GMT) Full text and rfc822 format available.

Message #16 received at 61580-done <at> debbugs.gnu.org (full text, mbox):

From: Darius Foo <darius.foo.tw <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 61580-done <at> debbugs.gnu.org
Subject: Re: bug#61580: line-prefix and display text properties cause odd
 cursor movement
Date: Fri, 3 Mar 2023 12:14:00 +0800
[Message part 1 (text/plain, inline)]
> No further comments, so I'm now closing this bug as fixed.

Yes, it works now. Thanks for fixing it so quickly!
[Message part 2 (text/html, inline)]

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 31 Mar 2023 11:24:10 GMT) Full text and rfc822 format available.

This bug report was last modified 363 days ago.

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