Re: *roff hyphenation trivia challenge

[Tadziu Hoffmann]

> I prefer groff's behaviour because I don't ever want correct
> hyphenation points to be ignored. Using \% is almost always a
> correction to the hyphenation logic.

Groff's current behavior is weirdly inconsistent.
It already *does* ignore correct hyphenation points,
namely before the first "\%" (but allows them afterward).
Except if the word *starts* with "\%" and does not contain
any other "\%", in which case hyphenation is entirely
suppressed in the whole word.

My concern is that if "\%" only allows specifying
*additional* hyphenation points, then we have no method
of forbidding hyphenation points that the patterns
incorrectly allow.  (Unless you count weird tricks like
inserting "\h'0p'" that could mess with the kerning.)