Re: font-lock-comment-delimiter-face

[Richard Stallman]

    For C++ mode, it doesn't quite work:

       foo // comment1
       bar /* comment2 */

    The // and /* are put in font-lock-comment-delimiter-face (which I find to
    be useless clutter and makes the text less legible without helping
    understand the structure), but the */ is left with just
    font-lock-comment-face.

That is because comment-end is empty in C++ mode.

I see there is a variable comment-end-skip, whose doc string suggests
it ought to be useful for this (but the doc string is not entirely
clear tome).  But it doesn't seem to be set up in C++ mode.  Should it
be?

    In SML mode I see another problem:

       (* comment 1 start
          (* nested comment *)
          comment 1 end *)

    The first (* is in f-l-c-d-f, the second isn't.  That's correct.
    OTOH depending on how the text is refontified, not only the second *)
    but sometimes also the first *) gets the new f-l-c-d-f.

I don't see how to handle nested comments easily.

    I don't understand the above.  In what way does the current code change what
    font-lock-comment-face looks like?

When I added font-lock-comment-delimiter-face, I copied the
definition of font-lock-comment-face into it, then changed
the definition o font-lock-comment-face.

It would be cleaner to leave font-lock-comment-face unchanged and
define font-lock-comment-text-face with the modified value.
However, I couldn't make that work.  Adapting the code in
font-lock-fontify-syntactically-region in a straightforward
way resulted in incorrect results, and I don't know why.