canonical_supp_nav_chain_with_inventory_source of a chain: one empty inventory source per entry the chain holds. The navigation event and the stories tray's viewpoint name the same chain, so both spell the field with this one helper.
canonical_supp_nav_chain_with_inventory_source
canonical_supp_nav_chain_with_inventory_sourceof a chain: one empty inventory source per entry the chain holds. The navigation event and the stories tray's viewpoint name the same chain, so both spell the field with this one helper.