v3.10.2

Fixes

• Dropping a dragged node in the empty area below the last row fires onMove
  again (issue #313). The drop logic had been moved into the per-row drop hook but
  never added to the outer (bottom-of-list) drop target, so drops to the very
  bottom of the tree were silently ignored. The shared handler now lives on
  tree.drop() and is used by both drop targets. (#361)