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bug#64730: 30.0.50; Mark activation doesn't work after insert
From: |
Eli Zaretskii |
Subject: |
bug#64730: 30.0.50; Mark activation doesn't work after insert |
Date: |
Wed, 19 Jul 2023 18:05:40 +0300 |
tags 64730 notabug
thanks
> Cc: public@protesilaos.com
> From: Bruno Boal <egomet@bboal.com>
> Date: Wed, 19 Jul 2023 12:17:21 +0100
>
> I'm trying to evaluate the following snippet in emacs -Q, however as
> soon as I try to insert a character, the region is not highlighted
> anymore. `activate- mark' doesn't make it work either. Whereas
> interactively with `exchange-point-and-mark' the region gets proper highlight.
>
> (progn
> (insert "")
> (push-mark (line-beginning-position) :no-message :activate))
>
> (progn
> (insert "a")
> (push-mark (line-beginning-position) :no-message :activate))
This is the intended behavior. The ELisp manual says in the node "The
Mark":
-- Variable: deactivate-mark
If an editor command sets this variable non-‘nil’, then the editor
command loop deactivates the mark after the command returns (if
Transient Mark mode is enabled). All the primitives that change
the buffer set ‘deactivate-mark’, to deactivate the mark when the
command is finished. Setting this variable makes it buffer-local.
To write Lisp code that modifies the buffer without causing
deactivation of the mark at the end of the command, bind
‘deactivate-mark’ to ‘nil’ around the code that does the
modification. For example:
(let (deactivate-mark)
(insert " "))