[bug #42870] [troff] revise hyphenation code management

[G. Branden Robinson]

Follow-up Comment #16, bug #42870 (group groff):

[comment #0 original submission:]
> `.hw' [is] limited to raw 8bit characters.

This is not true, and seems not to have been true as far back as _groff_
1.22.3.


$ cat EXPERIMENTS/hw-with-special-character.groff
.\" groff -K utf8
.na
.ll 5n
.hw h\['a]-worth
Jack H\['a]worth is an agent of destruction.
Jack H\[a aa]worth is an agent of destruction.
Jack Háworth is an agent of destruction.
.pl \n[nl]u
$ ~/groff-1.22.3/bin/groff -T utf8 -Wbreak -K utf8
EXPERIMENTS/hw-with-special-character.groff
Jack
Háworth
is an
agent
of
de‐
struc‐
tion.
Jack
Háworth
is an
agent
of
de‐
struc‐
tion.
Jack
Háworth
is an
agent
of
de‐
struc‐
tion.


I get the same results with _groff_ 1.22.4, 1.23.0, and Git HEAD.


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