Dragging will fail if you drop below bottom of list

If you select a node/tree and drag it below the main list, a destination highlight will appear, but releasing the node will not successfully move it. It appears that visually, it's detecting the drag correctly, but for the actual moving of the nodes, it requires that you drag to exactly the bottom of the left-side line to drop something at the bottom of the list.

Additionally, I think if you drag to beyond the bottom of the list it would be better to drop the nodes in the root, rather than inside the bottom-most node (as the visual indicator suggests it would do, if it worked). That's a preference issue.