bug#60983: 29.0.60; Tree-sitter user-level control

[Eli Zaretskii <eliz@gnu.org>]

> From: Theodor Thornhill <theo@thornhill.no>
> Cc: casouri@gmail.com, bug-gnu-emacs@gnu.org
> Date: Wed, 25 Jan 2023 21:12:53 +0100
> 
> > Adding Stefan in case he has some advice.
> 
> Ok, I added a patch below.
> 
> 
> try:
> 
> 1. open some c buffer and make some edits, for example
> ```
> void
> main()
> {
>   if (x)
>     {
>     }
> }
> ```
> 
> This should be the expected output when using the gnu style.
> 
> 2. M-x c-ts-mode-set-style "bsd" RET
> 
> 3. C-h o c-ts-mode-indent-style RET
>   Observe variable has changed, but indenting the code does not.
> 
> 4 C-h o treesit-simple-indent-rules RET
>   Observe variable keeps old value
> 
> 5. C-x x g
> 
> Now the bsd style takes effect, and the treesit-simple-indent-rules
> variable has changed.
> 
> I'm sure the fix is easy, but I don't see it.  I purposely kept the
> functions simple until I know what approach is best:)

Thanks, I'll wait until you adapt the changes to Stefan's comments,
and try the new code then.  If that doesn't fix the above problem, ask
the question again at that time.