bug#62412: 29.0.60; strange c++ indentation behavior with tree sitter

[Theodor Thornhill]

On 25 March 2023 09:53:31 CET, "João Távora" <joaotavora@gmail.com> wrote:
>On Fri, Mar 24, 2023 at 10:02 PM Theodor Thornhill via Bug reports for
>GNU Emacs, the Swiss army knife of text editors
><bug-gnu-emacs@gnu.org> wrote:
>e about the original purpose for this rule, CC’ing Theo.
>> >
>> >Yuan
>> I'll look more deeply into the cause of this, but the rule is covering some 
>> preproc directives iirc.
>>
>> Unfortunately tree-sitter behaves better when auto pairs is used. I would 
>> advise people to use electric-pairs-mode (if that's the correct name, on 
>> mobile now) to avoid these sorts of issues.
>
>electric-pair-mode, it's not on by default.
>
>But, for some reason, electric-indent-mode _is_ on by default,
>at least in c++-ts-mode.
>
>So this has nothing to do with tree-sitter IMO, it's just
>electric-pair-mode doing its thing.
>
>Why is it on by default?  A fair number of users don't like
>this electricity, or prefer to have it toned down.  At least
>this has been the  argument for not turning on electric-pair-mode
>by default, which is a much less jarring mode IMO, and one which
>would solve these problems.
>
>João

Yeah, maybe! But I was under the impression that indentation was electric by 
default in most modes, but I may be mistaken.

The reason I mentioned electric-pair-mode is that the parser fails less often 
when the closing paren or bracket is inserted, as it is much simpler to have a 
functional ast.