bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Eli Zaretskii]

> Date: Thu, 28 Dec 2023 13:44:43 +0200
> Cc: Denis Zubarev <dvzubarev@yandex.ru>, 67977@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> >> Could font-lock-dont-widen help, perhaps?
> > Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth 
> > reparses.
> 
> But then treesit major modes will be affected by user narrowing (e.g. if 
> the user narrowed to inside the string, the buffer won't be highlighted 
> as a string).

Why is that a problem?  When the user narrows the buffer, the part
outside the narrowing doesn't exist as far as Emacs is concerned.