GNU bug report logs - #13122
transpose-subr defeats save-excursion

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Chong Yidong <cyd <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13122: closed (transpose-subr defeats save-excursion)
Date: Fri, 21 Dec 2012 05:45:02 +0000

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Your message dated Fri, 21 Dec 2012 13:43:55 +0800
with message-id <87d2y4dko4.fsf <at> gnu.org>
and subject line Re: bug#13122: save-excursion not saving point
has caused the debbugs.gnu.org bug report #13122,
regarding transpose-subr defeats save-excursion
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: Jyothis V <jyothisv <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: save-excursion not saving point
Date: Sat, 8 Dec 2012 11:50:13 +0530

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Hi,

I wrote the following version of transpose-chars which is supposed to
always transform the last two chars without moving the point.
(defun gosmacs-tranpose-chars (n)
  (interactive "p")
  (save-excursion
    (forward-char (- n))
    (transpose-chars 1)))

The trouble is, even though I have used save-excursion, the point does
move 2 characters backwards when n=1! For other values of n, this seems to
be working fine.

Regards,
Jyothis V

In GNU Emacs 24.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.6.2)
 of 2012-11-18 on eric
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
Configured using:
 `configure '--prefix=/usr' '--sysconfdir=/etc' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--with-x-toolkit=gtk3' '--with-xft'
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector
 --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2'
 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro''

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  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
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  default enable-multibyte-characters: t

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From: Chong Yidong <cyd <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: Jyothis V <jyothisv <at> gmail.com>, 13122-done <at> debbugs.gnu.org
Subject: Re: bug#13122: save-excursion not saving point
Date: Fri, 21 Dec 2012 13:43:55 +0800

martin rudalics <rudalics <at> gmx.at> writes:

> This is a limitation (or bug) in the code of `transpose-subr' and
> `transpose-subr-1' due to the use of `delete-and-extract-region' (IIRC
> transposing mangles `undo' as well.)

I've committed a fix to trunk.

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