GNU bug report logs - #21885
24.5; Transposing things with a negative argument

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Barzilay <eli <at> barzilay.org>
Subject: bug#21885: closed (Re: bug#21885: 24.5; Transposing things with a
 negative argument)
Date: Fri, 13 Nov 2015 09:49:03 +0000

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Your bug report

#21885: 24.5; Transposing things with a negative argument

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 21885 <at> debbugs.gnu.org.

-- 
21885: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21885
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Eli Barzilay <eli <at> barzilay.org>
Cc: 21885-done <at> debbugs.gnu.org, stephen_leake <at> stephe-leake.org, rudalics <at> gmx.at
Subject: Re: bug#21885: 24.5; Transposing things with a negative argument
Date: Fri, 13 Nov 2015 11:47:54 +0200

> Date: Thu, 12 Nov 2015 14:27:07 -0500
> From: Eli Barzilay <eli <at> barzilay.org>
> Cc: Stephen Leake <stephen_leake <at> stephe-leake.org>, 21885 <at> debbugs.gnu.org, 
> 	martin rudalics <rudalics <at> gmx.at>
> 
> On Thu, Nov 12, 2015 at 1:24 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:
> >> From: Stephen Leake <stephen_leake <at> stephe-leake.org>
> >> Date: Thu, 12 Nov 2015 12:11:42 -0600
> >> Cc: 21885 <at> debbugs.gnu.org
> >>
> >> Eli Barzilay <eli <at> barzilay.org> writes:
> >>
> >> > In the past (IIRC, up to around v24.3) transposing things (chars,
> >> > words, sexprs, lines) would always leave the point after the
> >> > transposed thing. ...  This is no longer happenning.
> > [...]
> >
> > I think I know the answer: the difference is visible only if you
> > invoke C-t with a negative argument, as in "C-- C-t".
> 
> Yes, exactly -- and yes, this is the same bug as #20698.  I looked at
> the code a bit more since then, and I think that my patch is a fine fix.

Thanks, pushed.

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From: Eli Barzilay <eli <at> barzilay.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; Transposing things with a negative argument
Date: Thu, 12 Nov 2015 03:12:07 -0500

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In the past (IIRC, up to around v24.3) transposing things (chars,
words, sexprs, lines) would always leave the point after the
transposed thing.  This means that I could always use a `C--' prefix
to "drag" the current thing backwards in the same way that the default
action drags it forwards.  This is no longer happenning.

After a few trials the thing that seems to fix it is adding this line
at the end of the `transpose-subr' definition:

    (goto-char (+ (car pos2) (- (cdr pos1) (car pos1))))

To be clear, this is not a backward incompatible change -- it fixes
the *current* incompatible change.

Patch file attached.

[0001-Fix-transpose-subr-with-a-negative-argument.patch (application/octet-stream, attachment)]

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-- 
                    ((x=>x(x))(x=>x(x)))                   Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!

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