bug#72437: Unexpected behavior when inserting with prefix arg in electric-pair-mode

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Hi João,

Do you have a good idea of how to make

   C-M-SPC C-2 {

wrap the selected word within two braces?


        Stefan


Eli Zaretskii [2024-08-03 12:12:06] wrote:

>> Cc: eliz@gnu.org
>> From: Joseph Turner <joseph@breatheoutbreathe.in>
>> Date: Sat, 03 Aug 2024 00:12:33 -0700
>> 
>> Migrated from this thread on the devel mailing list:
>> 
>> https://yhetil.org/emacs-devel/86ikwiumza.fsf@gnu.org/T/#t
>> 
>> 
>> On Emacs 29.4, with emacs -Q
>> 
>> Turn on electric-pair-mode
>> 
>> (electric-pair-mode +1)
>> 
>> Then press "C-2 ("
>> 
>> Expected result:
>> 
>> Either (()) or ()()
>> 
>> Actual result:
>> 
>> (()
>> 
>> 
>> I noticed the unexpected behavior when attempting to surround some text
>> with multiple braces in order to create Anki flashcards.
>> 
>> More or less, I wanted to go from "foo" to "{{foo}}", and I thought
>> perhaps that with the whole word selected, pressing "C-2 {" would DTRT.
>> 
>> In general, I'm not sure whether "{}{}" or "{{}}"is more useful or
>> expected, but I suspect both are better than "{{}".
>
> Making it produce "{}{}" is relatively easy: we just need to call the
> post-self-insert-hook for each of the ARG inserted characters.  OTOH,
> to produce "{{}}" we'd probably need to rewrite the
> electric-pair-mode's hook function, but I have no idea how to rewrite
> it to do that.
>
> Stefan, any suggestions?