From: Markus Triska <triska@metalevel.at>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 35177@debbugs.gnu.org
Subject: bug#35177: 27.0.50; Binding deactivate-mark to nil unexpectedly deactivates the mark
Date: Mon, 08 Apr 2019 12:03:11 +0200 [thread overview]
Message-ID: <87mul0rezk.fsf@metalevel.at> (raw)
In-Reply-To: <m2tvfa3ca1.fsf@metalevel.at>
Eli Zaretskii <eliz@gnu.org> writes:
> None of your additional test cases do what I said I thought you should
> do, though, do they?
In emacs -Q, please evaluate the following form with C-x C-e:
(let (deactivate-mark)
(switch-to-buffer (get-buffer-create "t"))
(insert "hello")
(set-mark-command nil)
(move-beginning-of-line nil))
This does what you say. However, the mark is deactivated after the form
is executed, which is the opposite of what I expect from this snippet.
> I don't think it's something in your code that deactivates the mark,
> it's what Emacs does internally when a command finishes.
I noticed that the mark stays activate (as expected), when I add a
"redisplay" after switch-to-buffer:
(let (deactivate-mark)
(switch-to-buffer (get-buffer-create "t"))
(redisplay)
(insert "hello")
(set-mark-command nil)
(move-beginning-of-line nil))
After I evaluate this, the first form also consistently retains the
active mark when I evaluate it. It is expected that the mark stays
active, but it is unexpected that it does so after I evaluate the second
form, yet is deactivated if I only evaluate the first form.
Please also note that the documentation of deactivate-mark states
"around the code that does the modification". If other preconditions are
necessary to consistently retain the active mark, could you please
document them? Thank you.
next prev parent reply other threads:[~2019-04-08 10:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-07 0:11 bug#35177: 27.0.50; Binding deactivate-mark to nil unexpectedly deactivates the mark Markus Triska
2019-04-07 15:42 ` Eli Zaretskii
2019-04-07 22:39 ` Markus Triska
2019-04-08 2:35 ` Eli Zaretskii
2019-04-08 10:03 ` Markus Triska [this message]
2019-04-08 15:09 ` Eli Zaretskii
2019-04-08 15:50 ` Markus Triska
2019-04-08 16:00 ` Eli Zaretskii
2019-04-09 0:04 ` Noam Postavsky
2019-04-09 15:26 ` Markus Triska
2019-04-09 23:46 ` Noam Postavsky
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