Refrain from listener rebinding when address families differ
retry_listener_ports, we check if port matches exactly and one of the addresses is a wildcard address:
2795 const int may_need_rebind = 2796 port_matches_exact && bool_neq(tor_addr_is_null(&wanted->addr), 2797 tor_addr_is_null(&conn->addr));
We should also check if address family is the same between old and new listener. If they differ, we don't need to do rebinding. See discussion on legacy/trac#17873 (moved).