fix(drag-drop): don't allow user to move item into container that isn't connected to current one by passing it over an intermediate one that is #15660
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In a setup like
Container 1 <-> Container 2 <-> Container 3
the user shouldn't be allowed to move items between containers 1 and 3, because they're not connected. This is currently possible if the user passes it through container 2 first. These changes rework the logic so that this is no longer possible.Fixes #15191.