bug#63840: 29.0.91; c-ts-mode fails to fontify common C extension

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Thu, 15 Jun 2023 22:05:33 -0700
> Cc: Theodor Thornhill <theo@thornhill.no>,
>  Po Lu <luangruo@yahoo.com>,
>  63840@debbugs.gnu.org
> 
> > Ping!  Any progress with this?
> 
> The best option is to ask tree-sitter-c to recognize $. I see a PR for it but 
> the author closed it shortly after posting, not sure what was going on[1].

Any hope of re-opening it, or at least asking why it was closed
without fixing?

> Fixing it ourselves involves checking every identifier during fontification. 
> Is that something we want to do?

How would that work?  Can you describe how could this be implemented?
It is hard to decide whether it's something we want to do without
knowing the implications.