[bug #63354] Refine fallbacks.tmac

[G. Branden Robinson]

Follow-up Comment #16, bug #63354 (project groff):

The explanation for the first half of comment #8 appears to be this.

https://git.savannah.gnu.org/cgit/groff.git/tree/src/libs/libgroff/uniglyph.cpp?id=59efbfc364daee11af9207a3fc79675b6f5bfc25#n334

Normally, I get this:


$ printf '.fchar \\[u2010] BOGOSITY\nfoo\\[u2010]bar\n.pl \\n[nl]u\n' |
./build/test-groff -Tps -a
<beginning of page>
foo<hy>bar


But if I change it to something obviously wrong, I get this:


$ printf '.fchar \\[u2010] BOGOSITY\nfoo\\[u2010]bar\n.pl \\n[nl]u\n' |
./build/test-groff -Tps -a
<beginning of page>
foo<sl>bar


And if I comment it out, I get this:


$ printf '.fchar \\[u2010] BOGOSITY\nfoo\\[u2010]bar\n.pl \\n[nl]u\n' |
./build/test-groff -Tps -a
<beginning of page>
foo<u2010>bar


N.B., groff -a output does not "chase" fallback character definitions of the
sort we use in "fallback.tmac".


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