GNU bug report logs - #10738
insert before setting the mark means the mark wont be set

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Christopher Monsanto <chris <at> monsan.to>
To: bug-gnu-emacs <at> gnu.org
Subject: insert before setting the mark means the mark wont be set
Date: Mon, 6 Feb 2012 12:57:36 -0500

From emacs -q, consider the following program:

(defun foo ()
  (interactive)
  (insert "bar")
  (push-mark)
  (forward-line)
  (activate-mark))

M-x foo, bar appears, but the mark is not set.

(defun baz ()
   (interactive)
   (push-mark)
   (forward-line)
   (activate-mark))

I wouldn't expect a command *before* setting the mark to affect if the
mark was actually set. Is this a concurrency bug?



In GNU Emacs 24.0.93.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.6)
 of 2012-02-04 on WORKCOMPUTER
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
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Christopher Monsanto
chris <at> monsan.to  --  http://monsan.to/

Message #8 received at 10738 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Christopher Monsanto <chris <at> monsan.to>
Cc: 10738 <at> debbugs.gnu.org
Subject: Re: bug#10738: insert before setting the mark means the mark wont be
	set
Date: Mon, 06 Feb 2012 16:24:37 -0500

>> From emacs -q, consider the following program:
> (defun foo ()
>   (interactive)
>   (insert "bar")
>   (push-mark)
>   (forward-line)
>   (activate-mark))

> M-x foo, bar appears, but the mark is not set.

> (defun baz ()
>    (interactive)
>    (push-mark)
>    (forward-line)
>    (activate-mark))

> I wouldn't expect a command *before* setting the mark to affect if the
> mark was actually set. Is this a concurrency bug?

The mark gets deactivated after a command that modifies the buffer.
`foo' above is a command that modifies the buffer, so the mark is
deactivated afterwards.  This is done via the
`deactivate-mark' variable.
You can let-bind it around the call to `insert' to prevent that variable
from being set.


        Stefan

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