bug#1810: 23.0.60; visual-line-mode moves to the wrong column

bug#1810: 23.0.60; visual-line-mode moves to the wrong column

[Juri Linkov]

When `line-move-visual' is non-nil, moving down from a control character
moves to the wrong column.

Test case:

1. insert to a new buffer the following text:

^@est.
Test2.
Test3.

where ^@ at the beginning of the buffer is a NULL control character.

2. Move to the beginning of the buffer (M-<).

3. Move down (C-n) - point jumps from the *first* column of the first line
to the *second* column of the second line.

This behavior can be traced back to the function `posn-at-point'
that returns the x-coordinate of the second character in the displayed
control sequence "^@" instead of the first character where point
is actually located.

-- 
Juri Linkov
http://www.jurta.org/emacs/

bug#1810: marked as done (23.0.60; visual-line-mode moves to the wrong column)

[Emacs bug Tracking System]

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Your message dated Sat, 10 Jan 2009 13:42:40 -0500
with message-id <87mydz2ean.fsf@cyd.mit.edu>
and subject line Re: 23.0.60; visual-line-mode moves to the wrong column
has caused the Emacs bug report #1810,
regarding 23.0.60; visual-line-mode moves to the wrong column
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
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From: Juri Linkov <juri@jurta.org>
To: emacs-pretest-bug@gnu.org
Subject: 23.0.60; visual-line-mode moves to the wrong column
Date: Tue, 06 Jan 2009 19:45:07 +0200
Message-ID: <87ljtowcwc.fsf@jurta.org>

When `line-move-visual' is non-nil, moving down from a control character
moves to the wrong column.

Test case:

1. insert to a new buffer the following text:

^@est.
Test2.
Test3.

where ^@ at the beginning of the buffer is a NULL control character.

2. Move to the beginning of the buffer (M-<).

3. Move down (C-n) - point jumps from the *first* column of the first line
to the *second* column of the second line.

This behavior can be traced back to the function `posn-at-point'
that returns the x-coordinate of the second character in the displayed
control sequence "^@" instead of the first character where point
is actually located.

-- 
Juri Linkov
http://www.jurta.org/emacs/



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From: Chong Yidong <cyd@stupidchicken.com>
To: Juri Linkov <juri@jurta.org>
Cc: 1810-done@emacsbugs.donarmstrong.com
Subject: Re: 23.0.60; visual-line-mode moves to the wrong column
Date: Sat, 10 Jan 2009 13:42:40 -0500
Message-ID: <87mydz2ean.fsf@cyd.mit.edu>

> When `line-move-visual' is non-nil, moving down from a control character
> moves to the wrong column.
>
> This behavior can be traced back to the function `posn-at-point' that
> returns the x-coordinate of the second character in the displayed
> control sequence "^@" instead of the first character where point is
> actually located.

I've checked in a fix.  Thanks.