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

[Eli Zaretskii]

> From: Theodor Thornhill <theo@thornhill.no>
> Cc: 60983@debbugs.gnu.org
> Date: Thu, 26 Jan 2023 08:37:42 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Yuan or Theo, would one of you please make the change of making
> > treesit-font-lock-level a defcustom, with a proper :set functions to
> > avoid the need to revisit the file?  My hands are too full ATM, and
> > this issue is basically the only one which prevents me from updating
> > the Emacs user manual with the tree-sitter info, which in turn is the
> > only issue that blocks the move to releasing the 29.0.90 pretest
> > tarball.
> >
> > TIA
> 
> 
> I can take a stab at it :)

Thanks!