Re: heading spacing

[Karl Berry]

    The previous code implemented the rule that the space below each heading
    (of a certain type) should be fixed.  I think this rule is important.

Well, I went back and forth on that.  But ok, this morning, I guess I
agree.

As for \nobreaks,
1) it seems we need a \nobreak before the \kern, since that kern is
   immediately followed by glue.
2) I guess you're right that \nobreak is not needed at the end, although
   it still seems scary to me.  I suppose in theory there could be a
   kern and then glue coming up next (from whatever follows the section
   heading), but I don't think that ever happens in practice.

Thanks,
k