bug#18343: 24.4.50; REGRESSION: `help-echo' property is not added, so no tooltip or echo

[Drew Adams]

> > Why not tell font-lock hands-off this property, which has nothing to
> > do with highlighting?
> 
> See lisp-mode.el for one answer.

Too unclear.  What part of that library do you think is
significant here?  What's your point?

(And what does `help-echo' have to do with Lisp mode,
necessarily?)