[tex-eplain] \leavevmode in front of hyperlinks

[Karl Berry]

    I was wondering maybe someone had uses for links starting in
    vertical mode when working with dvipdfm.

I can't imagine.  My guess is that it's more an artifact of \special
working in vertical mode ...

Seems like the cleanest thing to do is just \ifvmode\leavevmode\fi
before outputting a link.  (Of course this should only be done if
hyperlinks are actually enabled.)  We'll learn soon enough if it causes
a problem somehow.

Thanks,
k