bug#23387: 25.0.93; Unicode quote inserted in Python mode outside of strings

[Philipp Stephani <p.stephani2@gmail.com>]

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Philipp Stephani <p.stephani2@gmail.com> schrieb am Do., 28. Apr. 2016 um
19:11 Uhr:

> Philipp Stephani <p.stephani2@gmail.com> schrieb am Mi., 27. Apr. 2016 um
> 16:16 Uhr:
>
>>
>> emacs -Q
>> M-x electric-quote-mode
>> M-x customize-variable RET electric-quote-string, set it to t, save
>> M-x python-mode
>> Hit '
>>
>> Expected: ' (ASCII apostrophe) is inserted because point is outside a
>> string
>> Actual: ’ (Unicode quote) is inserted
>>
>> This seems to happen only in Python mode, not in e.g. emacs-lisp-mode.
>>
>> Also happens in C++ mode, and probably others.
>

The root cause is that electric-quote-post-self-insert-function uses
syntax-ppss to check whether point is in a string or comment. Before it
makes any replacement, the ASCII apostrophe is still in the buffer, so
syntax-ppss considers point to be inside a string. It looks like calling
syntax-ppss with (forward-point -1) as argument instead of (point) should
fix it, but I'm not sure whether that's the right way.

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