bug#67262: python-ts-mode cannot identify triple-quoted-strings

[Eli Zaretskii]

> From: JD Smith <jdtsmith@gmail.com>
> Date: Sat, 18 Nov 2023 10:52:05 -0500
> 
> Inside this triple-quoted string, in a python buffer:
> 
> a = """This is a test"""
> 
> python-mode yields (python-info-triple-quoted-string-p)=t, whereas 
> python-ts-mode gives nil,
> defeating the fancy doc string folding both modes implement.
> 
> The reason seems to be that (syntax-ppss) returns something different in 
> position 3 (which is "non-nil
> if inside a string”) between these modes: 
> 
> * t for python-mode (which signals a triple quote)
> *  ?34=" in python-ts-mode 
> 
> If you first load python-mode, then load python-ts-mode, the syntax parse 
> becomes equal between the
> modes, and this bug vanishes.  

Can you figure out which part of python-mode's initialization makes
the above work correctly, and why?  Then we could discuss whether
moving that part into python-base-mode is TRT.

Thanks.