bug#62429: 30.0.50; Add jsx faces to typescript-ts-mode

[Eli Zaretskii <eliz@gnu.org>]

> From: Yuan Fu <casouri@gmail.com>
> Date: Thu, 30 Mar 2023 01:11:48 -0700
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
>  62429-done@debbugs.gnu.org,
>  theodor thornhill <theo@thornhill.no>
> 
> >>> OK, but then how will these JSX-specific faces fit into the overall
> >>> scheme of treesit-font-lock faces?  For example, in what level will
> >>> they be used, and how will users know what level to set to see these
> >>> faces in their buffers?
> >> 
> >> At level 3 for tsx-ts-mode, under the “jsx” feature. So they are enabled by default. Though it’s true that it’s not immediately obvious what face to customize. At the very least these faces appear in the customize group of typescript. We can add something to the docstring of the major mode, too.
> >> 
> >>> 
> >>> These are the downsides of mode-specific faces, and if we think it's
> >>> important enough to have them, we should resolve these issues when we
> >>> install such faces.
> > 
> > Then it is fine by me, as long as those measures you mentioned are
> > taken to make sure users know how to customize font-lock with these
> > faces.
> 
> Cool. I pushed the change.

Thanks, but please also tell in the doc string of the mode which
font-lock level uses these special faces.