bug#62333: 30.0.50; Issue with tree-sitter syntax tree during certain changes

[Eli Zaretskii]

> Date: Thu, 30 Mar 2023 17:27:02 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: wkirschbaum@gmail.com, casouri@gmail.com, 62333@debbugs.gnu.org, 
>     dgutov@yandex.ru
> 
> > The parsers _can_ have access to those ranges, if they need it for some 
> > reason.  In general, everything in Emacs should honor the current 
> > restriction, unless there's a good reason to ignore it.
> 
> Okay, so in the above example by default the parsers will only have access 
> to 1000-1100 for the first one, and 1100-1200 for the second one until the 
> user removes the restrictions.  Unless they need to widen the buffer for 
> some (good) reason.
> 
> If they do widen, will the parsers get access to [400..1100] and 
> [1100..1500], or to the whole buffer?

The former.

> > The problem with ignoring it is that we can never know which code/user 
> > defined the restriction and for what purpose.  I hope that keeping the 
> > parser's restrictions as part of the parser itself will allow us to 
> > break free of that issue when we have to widen.
> 
> At least it's a possibility that seems worth investigating.

I think so, yes.