I've half figured it out.
I was reading OpenLayers.Handler.Drag instead of
OpenLayers.Control.DragFeature. onComplete is OL and the equivalent property
for new points is featureAdded - which works for new points. Hurrah!
But using {featureAdded: onNewLine} for a line causes the linedraw feature
to stop after adding the second point, rather than on double-click, and
doesn't return the coords.
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