Very simple problem: my droppable items are timeslots, so they should
only accept one draggable.  I need a useful way to prevent a second
draggable from being dropped there, but to allow the original
draggable to be moved elsewhere.

>From what I can see of the API, it appears my only real choice is to
determine this in a function for revert on the Draggable item.  I'm
fine with that, but I'm not sure how to determine that the Droppable
is full.   I can set a variable with onDrop for the Droppable, but it
doesn't seem to be possible to unset that variable when the Draggable
leaves for greener pastures.

Has anyone else bounced off this problem before?  Got any good ideas?

I can post a small example if anyone wants to see that.

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