GNU bug report logs - #3494
23.0.94; line-move-visual: temporary goal column confused by hscrolling

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Message #47 received at 3494 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Teemu Likonen <tlikonen <at> iki.fi>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 3494 <at> debbugs.gnu.org,
        Johan Bockgård
 <bojohan <at> gnu.org>,
        Kees Bakker <kees <at> altium.nl>
Subject: Re: bug#3494: 23.0.94; line-move-visual: temporary goal column confused by hscrolling
Date: Sat, 11 Jul 2009 21:02:48 +0300

On 2009-07-11 13:25 (-0400), Chong Yidong wrote:

> Teemu Likonen <tlikonen <at> iki.fi> writes:
>
>>  1. emacs -Q -f toggle-truncate-lines
>>
>>  2. Don't change the size of the window. Create test buffer with
>>     commands:
>>
>>         C-u 85 a RET
>>         C-u 100 b RET
>>
>>  3. Move the cursor to the end of the first (the line with a's).
>>
>>  4. Enable goal column: C-x C-n
>>
>>  5. Repeat C-n and C-p. The column changes quite wildly.
>>
>> The problem goes away if I set line-move-visual to nil.
>
> I can't reproduce this.  Could you try with the latest patch in the
> trunk?

The above is 100% reproducible in my Debian GNU/Linux system. I use the
GTK version

    GNU Emacs 23.1.50.1 (i686-pc-linux-gnu, GTK+ Version 2.12.12) of
    2009-07-11 on mithlond

This is the revision I compiled (with make bootstrap):

    commit 9bcb78f2eeba70b10d6d1d74dd98c1b36dfc1ca6
    Author: Chong Yidong <cyd <at> stupidchicken.com>
    Date:   2009-07-11 16:36:05 +0000

        * simple.el (temporary-goal-column): Change the value for
        line-move-visual to a cons cell.
        (line-move-visual): Record or set the window hscroll, if
        necessary (Bug#3494).
        (line-move-1): Handle cons value of temporary-goal-column.

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