bug#20256: 25.0.50; css-mode: filling multi-line comments

[Stefan Monnier <monnier@IRO.UMontreal.CA>]

> +                  (adaptive-fill-function
> +                   (lambda ()
> +                     (when (looking-at "[ \t]*/\\*[ \t]*")
> +                       (let ((str (match-string 0)))
> +                         (and (string-match "/\\*" str)
> +                              (replace-match " *" t t str)))))))

As mentioned, I think this had better be a buffer-local setting, rather
than a let-binding.  After all, it would be good if it also works for
auto-fill-mode.

Also this patch makes css-fill-paragraph non-generic (IOW it now only
works when comment-start is "/*"), so the comment:

        ;; This code is meant to be generic, so that it works not only for
        ;; css-mode but for all modes.

needs to be updated.  Of course, even better would be to avoid
hardcoding /* and */ and use comment-start/end/continue instead.


        Stefan