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Note that there are two drop modes -- when a single black line is shown, it means the drop will place the dropped items at the same level. When a black box is shown it means that the dropped items will be places as children of the boxed item. Now if you have
a
b
c
and you try to drop b, c on a when only a single black line is shown, it will refuse, because b, c are already immediately below a. You have to make sure the black box is showing when you drop.
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