From: Eli Zaretskii <eliz@gnu.org>
To: Andrey Listopadov <andreyorst@gmail.com>
Cc: 52896@debbugs.gnu.org
Subject: bug#52896: 29.0.50; transient-mark-mode is set to a lot of 'only syms
Date: Thu, 30 Dec 2021 21:20:16 +0200 [thread overview]
Message-ID: <83zgohhpcf.fsf@gnu.org> (raw)
In-Reply-To: <CAAKhXoYtLSM4N+y0sMqJzNj69PccM3rwXOndD1joBRGo9hJqmA@mail.gmail.com> (message from Andrey Listopadov on Thu, 30 Dec 2021 22:07:26 +0300)
> From: Andrey Listopadov <andreyorst@gmail.com>
> Date: Thu, 30 Dec 2021 22:07:26 +0300
> Cc: 52896@debbugs.gnu.org
>
> > How come transient-mark-mode became set to 'only' in the first place?
> > That is supposed to happen only when shift-translated commands are
> > used, and should be reset to the old value whenever the first
> > non-shift-translated command is used. See the doc string of
> > transient-mark-mode (the variable).
>
> The expand-region package sets transient mark mode to `only' when tmm
> is disabled:
>
> https://github.com/magnars/expand-region.el/blob/4b8322774d9c1d8b64a0049d1dbbc1e7ce80c1a0/expand-region-core.el#L57
> https://github.com/magnars/expand-region.el/blob/4b8322774d9c1d8b64a0049d1dbbc1e7ce80c1a0/expand-region-core.el#L163
>
> > You can see how it works if, in "emacs -Q", you press and hold Shift
> > and use arrow keys to move point, then evaluate
> >
> > M-: transient-mark-mode RET
> >
> > You should then see the value '(only . t)' of the variable. Once you
> > type some unshifted command, like C-f, the value becomes t again.
>
> Yes, I know, but in the case when transient mark mode is disabled, its
> value is not `(only . t)', but `(only . nil)' which is just `(only)'.
That's true, but in "emacs -Q", once I use a non-shifted command, the
value becomes just nil, as intended.
> > Bottom line: you should look in expand-region.el for the reasons of
> > this misbehavior, and perhaps report a bug to its developers.
>
> Unfortunately, Magnar Sveen disabled the issue-reporting feature of
> github for this particular project.
> However, looking at the docstring, I guess what expand-region does is
> correct, and the `exchange-point-and-mark' function does kind of a
> weird check - e.g. it checks if the car of `transient-mark-mode' is
> `only' and then conses another only to that.
> But again, I'm not sure what's the intention here, maybe it is expected.
It sounds like expand-region.el assumes something about an internal
implementation detail of this variable.
next prev parent reply other threads:[~2021-12-30 19:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-30 9:53 bug#52896: 29.0.50; transient-mark-mode is set to a lot of 'only syms Andrey Listopadov
2021-12-30 18:49 ` Eli Zaretskii
2021-12-30 19:07 ` Andrey Listopadov
2021-12-30 19:20 ` Eli Zaretskii [this message]
2021-12-30 20:02 ` Andrey Listopadov
2021-12-30 20:17 ` Eli Zaretskii
2021-12-30 20:20 ` Andrey Listopadov
2021-12-30 20:27 ` Andrey Listopadov
2021-12-30 20:32 ` Andrey Listopadov
2021-12-30 20:40 ` Andrey Listopadov
2022-01-03 14:21 ` Eli Zaretskii
2022-01-03 14:54 ` Eli Zaretskii
2022-01-07 18:17 ` Andrey Listopadov
2022-01-07 18:32 ` Eli Zaretskii
2022-01-07 18:52 ` Andrey Listopadov
2022-02-13 10:11 ` Lars Ingebrigtsen
2022-02-13 11:31 ` Andrey Listopadov
2022-02-13 13:23 ` Eli Zaretskii
2022-02-14 10:49 ` Lars Ingebrigtsen
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