bug#20732: in-string-p fails

[Stefan Monnier]

> Why not have two functions dealing with different circumstances.

Makes no sense.  The simpler solution is to make syntax-ppss let-bind
open-paren-in-column-0-is-defun-start.  After all, this variable's
optimization is not useful for syntax-ppss (which already optimizes the
same kinds of things but in a different way); it's only useful for
things like back_comment (i.e. things like backward-sexp, or
forward-comment with a negative argument).


        Stefan