EdgeDrawCancelReason = "noTarget" | "invalidConnection" | "invalidTarget" | "cancelled"

Reason an edge draw gesture was cancelled.

• noTarget — the user released on empty space (no target node/port snapped)
• invalidConnection — validateConnection() returned false
• invalidTarget — the target node doesn’t exist or the target port has wrong type
• cancelled — the gesture was aborted programmatically (e.g. Esc key, NgDiagramService.cancelActiveInteraction)