[FSceneOutlinerDragValidationInfo](API\Editor\SceneOutliner\FSceneOutlinerDragValidationInfo) ValidateDrop ( const [ISceneOutlinerTreeItem](API\Editor\SceneOutliner\ISceneOutlinerTreeItem) & DropTarget, const [FSceneOutlinerDragDropPayload](API\Editor\SceneOutliner\FSceneOutlinerDragDropPayload) & Payload ) const