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 Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#21885: closed (24.5; Transposing things with a negative argument)
Date: Fri, 13 Nov 2015 09:49:02 +0000

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Your message dated Fri, 13 Nov 2015 11:47:54 +0200
with message-id <83y4e2fcxh.fsf <at> gnu.org>
and subject line Re: bug#21885: 24.5; Transposing things with a negative argument
has caused the debbugs.gnu.org bug report #21885,
regarding 24.5; Transposing things with a negative argument
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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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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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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