[bug #63354] Refine fallbacks.tmac

[G. Branden Robinson]

Follow-up Comment #40, bug #63354 (group groff):

[comment #39 comment #39:]
> [comment #5 comment #5:]
> > Unicode's U+200B ZERO WIDTH SPACE has the semantics of groff's \: escape.
> 
> Arguably, so does U+0082 BREAK PERMITTED HERE.

I suggest that it doesn't.

[https://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_controls Wikipedia
says]:

> Follows a graphic character where a line break is permitted.
> *Roughly equivalent to a soft hyphen or zero-width space except
> it does not define what is printed at the line break*.

(emphasis added)

That caveat seems to hoist on us on the very petard that separates the
marauding `\:` Turk from the `\&` ground soaked by the bloodthirsty Romanians.


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