GNU bug report logs - #731
23.0.60; Varying point position after undo

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Markus Triska <markus.triska <at> gmx.at>
Subject: bug#731 closed by martin rudalics <rudalics <at> gmx.at> (Re: bug#731:
 23.0.60; Varying point position after undo)

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#731: 23.0.60; Varying point position after undo

It has been closed by martin rudalics <rudalics <at> gmx.at>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact martin rudalics <rudalics <at> gmx.at> by
replying to this email.


-- 
731: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=731
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Contact help-debbugs <at> gnu.org with problems

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From: martin rudalics <rudalics <at> gmx.at>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 731-done <at> debbugs.gnu.org, Markus Triska <markus.triska <at> gmx.at>,
        cyd <at> MIT.EDU
Subject: Re: bug#731: 23.0.60; Varying point position after undo
Date: Tue, 23 Sep 2008 08:33:31 +0200

Fixed as

2008-09-22  Martin Rudalics  <rudalics <at> gmx.at>

	* undo.c (record_point): Don't call Fundo_boundary for first
	change.  (Bug#731)

martin

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From: Markus Triska <markus.triska <at> gmx.at>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.0.60; Varying point position after undo
Date: Sat, 16 Aug 2008 18:59:05 +0200 (CEST)

When you put the following two forms in undo1.el:

   (progn
     (goto-char (point-max))
     (insert "test line\n"))

   (defun mytest ()
     (message "hi"))

then do "$ emacs -Q undo1.el", place point after the first form, press
C-x C-e then C-_, point is placed at the original end of buffer. In
contrast, every further time you do the same, point is placed at the
end of the second form after the insertion is undone. When you then
switch to the *scratch* buffer and then switch back and do the same,
point is again placed at the original end of the buffer exactly the
first time you do it, and placed at the other spot every further time.

I find it desirable that point position after undo become more
predictable in this case. I have also seen cases where point after
undo is completely misplaced (i.e., neither at the place where point
originally was, nor where the inserted text started), though I cannot
yet reproduce it reliably.

In GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2008-08-15 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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