This can get really complicated. Creating clones is not the issue. It's how to handle dragging something in and out of containers that scroll. I made a rough demo of how this might work a while ago. The hard part is figuring out if the user want the container to scroll, or are they trying to remove the item from the container as those are mutually exclusive actions.   See the Pen XdQPvJ?editors=1010 by osublake (@osublake) on CodePen  
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