Follow-up Comment #5, bug #60665 (project groff):
I said in comment #1:
> I haven't gone to the trouble of trying to contrive a case where groff
> runs out of space to distribute in troff mode, but I suspect based
> upon the above that it can. Maybe not, though. Maybe troff devices
> always have a horizontal resolution greater than one-twelfth of an em,
> and that is the smallest amount of distributable inter-word space we
> can manipulate with the .ss request.
This isn't quite right. In DWB 3.3 and groff, the units of the `ss` request
are twelfths of the `spacewidth` parameter of the font, not twelfths of an em.
This is not a minor distinction, since as Dave recently pointed out, the
`spacewidth` generally ranges from 1/4th to 1/3rd of an em.
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