bug#74415: 29.4; mouse-start-end does not respect syntax-table text properties

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

> No, it was not dead code before, but changing the outer condition
> makes it impossible for both the outer condition and the inner
> condition to be true at the same time.
> The current code is the following (inside a cond)
>
> ((and (= mode 1)
>       (= start end)
>       (char-after start)
>       (= (char-syntax (char-after start)) ?\())
>  (if (/= (syntax-class (syntax-after start)) 4) ; raw syntax code for ?\(
>      ;; This happens in CC Mode when unbalanced parens in CPP
>      ;; constructs are given punctuation syntax with
>      ;; syntax-table text properties.  (2016-02-21).
>      (signal 'scan-error (list "Containing expression ends prematurely"
>                                start start))
>    (list start
>          (save-excursion
>            (goto-char start)
>            (forward-sexp 1)
>            (point)))))

I have the strong impression that this reflects the fact that the
if+signal was a workaround which we're now replacing with an actual fix.


        Stefan