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bug#49999: 27.2; save-mark-and-excursion does not save mark-active
From: |
Lars Ingebrigtsen |
Subject: |
bug#49999: 27.2; save-mark-and-excursion does not save mark-active |
Date: |
Wed, 11 Aug 2021 17:46:57 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> I can reproduce this, but I'm not quite sure what's going on. I tweaked
> your function:
>
> (defun my-test-func ()
> "Test if save-mark-and-excursion is working."
> (interactive)
> (save-mark-and-excursion
> (goto-char (point-min))
> (add-face-text-property
> (point) (1+ (point)) (list :background "orange")))
> (message "%s" mark-active))
>
> This messages t -- but evaling mark-active afterwards shows that it's
> nil. So something is deactivating the mark after the command has run,
> apparently? Hm... this sounds vaguely familiar to me... Anybody know
> what could be going on here?
Oh, right -- it's transient mark mode that does this stuff? That is, if
you run a command that inserts something in the buffer, then it'll
switch the region off?
So `save-mark-and-excursion' works exactly as it should. But if you
don't want transient-mark-mode to switch itself off, you have to say
something like:
(defun my-test-func ()
"Test if save-mark-and-excursion is working."
(interactive)
(save-mark-and-excursion
(goto-char (point-min))
(with-silent-modifications
(add-face-text-property
(point) (1+ (point)) (list :background "orange")))))
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no