Two dates side by side put each one in a half-width Field2, which spends 120px
on its label column — the second label overlapped the first input and the row
ran off the panel. The comment ten lines above says exactly this about the
group/subgroup fields; one per row, as everything else in this editor.
Also shows a far-future end date as open-ended. RDA carries 9999-12-31 as "no
end" and printing it back reads like a real deadline.
The claim that an empty per-reference window inherits the award's is now a
test rather than a comment: a QSO before the award's own ValidFrom does not
count for a reference that has no window of its own, and a narrower reference
window still applies on top.