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Callback that fires while dragging a point. The mouse event is passed in as
parameter. The original data can be accessed from
e.origin, and the new
point values can be accessed from
e.newPoints. If there is only a single
point being updated, it can be accessed from
e.newPoint for simplicity, and
its ID can be accessed from
this context is the point
being dragged. To stop the default drag action, return false. See
drag and drop options.