bug#59686: 30.0.50; tree-sitter indentation in some loops and conditional statements is wrong

[Theodor Thornhill]

Eli Zaretskii <eliz@gnu.org> writes:

>> Cc: 59686@debbugs.gnu.org
>> Date: Fri, 02 Dec 2022 06:42:03 +0100
>> From:  Theodor Thornhill via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> 
>> >> // -*- c-ts -*-
>> >> int main() {
>> >>    for (int i=0; i<10; ++i) {
>> >>      foo(i);
>> >>    }
>> >>
>> >>    for (int i=0;
>> >>           i<10;
>> >>           ++i) {
>> >>             foo(i);
>> >>           }
>> >> }
>> >
>> >I see, that’s because the indent rule finds the BOL of the line where
>> >the "{" is on, and indents from there.  Theo, WDYT? Does indent style 
>> >fix this, or we should change the indent rules?
>> >
>> >Yuan
>> 
>> I've seen this issue myself, and have tried several combinations to fix it. 
>> It is trivial to fix this particular case, but because compound_statement is 
>> used everywhere problems will pop up other places. The fix here would be 
>> some grand-parent-bol function, but if my memory serves that would mess up 
>> the else in an if else. I'm happy to see this fixed, but just remember that 
>> it's not _super_ trivial.
>> 
>> Other languages exhibit similar issues, but with other constructs.
>
> FWIW, this is an unusual style, so I see no catastrophe if it is not 110%
> according to expectations.  Users can easily fix that by tweaking their BOLs
> where important.

Yeah, that was my reasoning as well.  I think we should come up with
some preset that can do this, but maybe when we know even more about how
to deal with similar edge cases?