Get the active drag-and-drop payload.
Borrowed current drag/drop payload, or null when no drag/drop payload is active.
peek directly into the current payload from anywhere.
returns null when drag and drop is finished or inactive.
Use ImGui.Payload_IsDataType(payload, type) to test the payload type.
ImGui.Payload_IsDataType(payload, type)
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Get the active drag-and-drop payload.