example_contact_list_manager_request_subscription_async: build set additively
example_contact_list_manager_request_subscription_async: build set additively

Also, call send_updated_roster() even if we'd already requested
subscription. This is realistic: we should be re-sending the subscription
request whenever the user tells us to.

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib