Use DndLeavePayload; dnd:enter and dnd:drop carry the same sessionId.
DndLeavePayload
dnd:enter
dnd:drop
sessionId
Identifier correlating dnd:enter, dnd:leave and dnd:drop for one drag gesture.
dnd:leave
Deprecated
Use
DndLeavePayload;dnd:enteranddnd:dropcarry the samesessionId.