[bug #64592] [troff] registers .m and .M contain no initial value

[G. Branden Robinson]

Follow-up Comment #9, bug #64592 (project groff):

We could certainly change the `default_color` object to give it a non-empty
name.  It doesn't seem like it should be a problem; the default color already
can't be redefined, so it's okay if it means different things for stroke and
fill.

There is also no way AFAIK to query the formatter with respect to how a color
is defined in practice.  (One can of course inspect device-independent output
from a document that draws using the stroke or fill colors.)

We might need to coordinate such a change with Peter Schaffter, since mom(7)
got bitten by bug #64421 and had to work around it.


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