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

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Package: emacs;

Reported by: Christopher Monsanto <chris <at> monsan.to>

Date: Mon, 6 Feb 2012 18:04:02 UTC

Severity: normal

Tags: notabug

Done: Glenn Morris <rgm <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Christopher Monsanto <chris <at> monsan.to>
Cc: 10738 <at> debbugs.gnu.org
Subject: 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
This bug report was last modified 13 years and 166 days ago.

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