bug#68246: 30.0.50; Add non-TS mode as extra parent of TS modes

[Yuan Fu]

> 
>>> Why can't we go to the ts modes we control ourselves and  write in
>>> this derivation?
>> 
>> Isn't this what my patch does?
> 
> Sorry.  Well in that case, that takes care of one misgiving :-)
> I suppose one way to proceed would be to try it out for some
> time and be ready to revert it, or parts of it?  Maybe announce
> on emacs-devel?

I’m all for it :-)

Yuan