[bug #66040] [troff] no longer warns about unrecognized .hcode input

[Dave]

Follow-up Comment #14, bug #66040 (group groff):

[comment #9 comment #9:]
> > why would it be a bug that the special character is
> > unrecognized only on its second appearance?
> 
> If you mean "as the second member of a pair with itself", I
> have an answer.

No, sorry for being unclear: I didn't mean its position in the .hcode list, I
meant the thing in comment #5 that I said "should work" based on my reading of
your new epic diagnostic.

(My reading may not be correct, but I get the same reading from this new text
added to the manual in
[http://git.savannah.gnu.org/cgit/groff.git/commit/?id=4449a4f06 commit
4449a4f06]: "@var{src1} must be an ordinary character (other than a numeral)
or a special character to which a hyphenation code has already been applied,"
so if I'm misunderstanding, I'm at least doing so consistently.)

> So it's good that our documentation does the headstand.
> We should not disclose what the hyphenation code values
> are, we need only to ensure that they sort into the correct
> equivalence classes,

Hmm, I wonder if there's a better framework for presenting the whole concept
to users.  Such as (off-the-cuff brainstorming here), there are two things
being stored about every character:
* Is it valid for hyphenation consideration at all?  This is a binary, yes/no
question.
* If the above is yes, what (if any) other hyphenation-equivalent characters
does it map to?

A user could imagine the binary value and the mapping something like:

no   @
yes  A a Á á Ä ä 
yes  B b
yes  C c Ç ç 

That there are "codes" at all ought to be irrelevant to the user's conceptual
framework (other than that word lurking in the request name "hcode").

> The solution I proposed above would indeed fix bug #42870,
> I think.  Do you agree?

It seems so to me.


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