bug#59660: 29.0.50; typescript-ts-mode consistently fontifies method-names incorrectly

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 59660@debbugs.gnu.org, theo@thornhill.no
> From: Yuan Fu <casouri@gmail.com>
> Date: Mon, 28 Nov 2022 15:06:30 -0800
> 
> > 1. create a typescript file (sample.ts)
> > 2. create class and add some methods to it.
> > 
> > I observe that:
> > 
> > - method names are consistently fontified as font-lock-property-face.
> > 
> > I expected that:
> > 
> > - method names to be consistently fontified as font-luck-function-name-face.
> > 
> > This seems to be because of the "property_identifier" is used for
> > functions in the treesitter-grammar, and this property is used
> > indiscriminately to apply font-lock-property-face at the bottom of the
> > major-mode grammar.
> > 
> > This "shadows" the former rules which correctly apply font-lock-function-name-face.
> > 
> > The best would obviously have a way to identify properties more accurately, to precent
> > shadowing from taking place. Unfortunately I cannot see a realiable way to do that
> > based on the current parse-tree.
> > 
> > Seeing as properties in Typescript are fairly rare while methods are very common,
> > it seems appropriate to me to remove the property-specific fontification rules
> > to restore the method-fontification rules.
> > 
> > I got a patch for this ready, if people are willing to accept it.
> 
> Maybe you can remove the :override flag for the property_identifier rule, so it doesn’t shadow the function rule? Would that work better?

This could be a personal preference, perhaps?  It isn't clear to me that
only one of the two is definitely correct.  So maybe we need a user option
for which one overrides which?