Issue dragging&dropping most of last items in a tree that exist after a 3level depth node. #60
Description
After upgrading to newer version from 2.1.5 i noticed that most of my nodes that exist at the end of the tree and while there exists a nested node before them cannot be dragged and dropped to any of the slots near them but can only be dropped at locations that are in the begginig of the tree. Same applies to the first tree example on the left shown in your demo.