bug#20732: in-string-p fails

[Andreas Röhler]

Am 04.06.2015 um 11:58 schrieb Dmitry Gutov:
> On 06/04/2015 12:27 PM, Andreas Röhler wrote:
>
> > (in-string-p) returns falsely nil, because it scans from "(defun "
>
> See "** Font Lock displays portions of the buffer in incorrect faces." 
> in etc/PROBLEMS.
>
> >      (let* ((erg (nth 8 (parse-partial-sexp (point-min) (point))))
>
> This is clearly inadequate, because it discards the performance 
> optimizations offered by `syntax-ppss'.

In question slow is better than false.

There is no way to know reliably if inside a string than scanning the 
whole buffer. All other is woodoo.

In result, it needs to consider these requests with care, re-use the 
result rather then salting la code with in-string-p calls. :)