RE: ffap highlighting persists

[Drew Adams]

    > In case this is considered to be a feature, here are some
    > arguments against it:
    >
    > 1. Such mouse-face highlighting suggests a link or button -
    >    that is, it suggests that you can click mouse-2 to follow
    >    the link. This is of course not the case.

    We could bind [mouse-2] on highlighted URLs to follow a link
    exactly like lisp/net/goto-addr.el does.

Oh, I don't think we want to do that - unless perhaps the buffer is
read-only. Ffap is used in all kinds of buffers, and you still want to be
able to use mouse-2 to paste text within, say, a file name or URL.

    > 2. It is not needed - if you can use ffap the first time without such
    >    highlighting, you can continue to do so without it. If you
    >    can get to all such choices in a menu, you don't need them
highlighted
    >    in the buffer.
    >
    > 3. It is distracting, and interferes with other highlighting.
    >
    > At the very least, such persistent highlighting should be optional.

    I agree.  A new option would be useful.

We might want to distinguish the face from the mouse-face highlighting, in
this discussion.