Update of bug#64728 (group groff):
Assigned to: gbranden => None
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Follow-up Comment #6:
The information needed here is a gathering of information about various *roff
implementations.
This stuff looks like it's so ill-defined that I think we want to check out
Seventh Edition Unix troff as well (which we can do with `tm` requests even if
the _program_ output is incomprehensible).
We should consider V7 troff, DWB 3.3, Heirloom Doctools, and possibly
plan9port and neatroff.
Do the diversion measurement registers `dn` and `dl` measure:
* net motion of the drawing position,
* maximal motion of the drawing position relative to that where the diversion
started,
or
* maximal bounds of spilled ink relative to the drawing position where the
diversion started?
Negative motions seem ill-defined with only two registers. Presumably this is
why all `sp` requests mean `sp 1` inside diversions, but possibly this insight
was insufficiently generalized back in the day.
Unassigning from self because I'm not the only person who can gather such
information.
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