GNU bug report logs - #18384
24.3.93; posn-col-row and posn-actual-col-row return different row number for point-min when header-line-format is non-nil

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dmitry <dgutov <at> yandex.ru>
Subject: bug#18384: closed (Re: bug#18384: 24.3.93; posn-col-row and
 posn-actual-col-row return different row number for	point-min when
 header-line-format is non-nil)
Date: Tue, 02 Sep 2014 15:21:04 +0000

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Your bug report

#18384: 24.3.93; posn-col-row and posn-actual-col-row return different row number for point-min when header-line-format is non-nil

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 18384 <at> debbugs.gnu.org.

-- 
18384: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18384
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Dmitry <dgutov <at> yandex.ru>
Cc: 18384-done <at> debbugs.gnu.org
Subject: Re: bug#18384: 24.3.93;
 posn-col-row and posn-actual-col-row return different row number
 for	point-min when header-line-format is non-nil
Date: Tue, 02 Sep 2014 18:20:13 +0300

> From: Dmitry <dgutov <at> yandex.ru>
> Date: Tue, 02 Sep 2014 01:13:03 +0400
> 
> 1. Open a simple buffer; maybe an empty one.
> 2. (setq header-line-format "aaaa")
> 3. (posn-actual-col-row (posn-at-point (point-min)))
> => (0 . 1)
> 4. (posn-col-row (posn-at-point (point-min)))
> => (0 . -1)
>
> I would also understand if the latter returned (0 . 0) instead of the
> same value, but -1 seems obviously wrong.

They are both wrong.  The correct result is (0 . 0), of course.

> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7390#40 ?

Yes, this is indeed a fall-out of bug #7390.  As you see in
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7390#49, the Y pixel
issue was fixed on the trunk (in r102407), but then my temporary
change in posn-col-row on the release branch, which shouldn't have
been merged onto the trunk, _was_ merged (in r102428) and screwed this
up.  Reverting that change fixed posn-col-row.

As for posn-actual-col-row, the problem was in posn-at-point, which
was returning incorrect row count when header line is present in the
window.  I fixed that as well.

Revision 117473 on the emacs-24 branch should fix both issues.

[Message part 3 (message/rfc822, inline)]

From: Dmitry <dgutov <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.93;
 posn-col-row and posn-actual-col-row return different row number for
 point-min when header-line-format is non-nil
Date: Tue, 02 Sep 2014 01:13:03 +0400

(Not a regression, same in Emacs 24.3 release, and apparently earlier versions).

1. Open a simple buffer; maybe an empty one.
2. (setq header-line-format "aaaa")
3. (posn-actual-col-row (posn-at-point (point-min)))
=> (0 . 1)
4. (posn-col-row (posn-at-point (point-min)))
=> (0 . -1)

I would also understand if the latter returned (0 . 0) instead of the
same value, but -1 seems obviously wrong.

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7390#40 ?

In GNU Emacs 24.3.93.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2014-08-18 on axl
Repository revision: 117447 eliz <at> gnu.org-20140817144850-xgexz1n2z8s4aiur
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04.1 LTS

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