Emitted when a client becomes interested in any token that was added with add_possible_client_interest.
The "signal detail" is a GQuark representing token. Modules implementing an interface (Location, say) should typically
connect to a detailed signal like "clients-interested::org.freedesktop.Telepathy.Connection.Interface.Location" rather than receiving all
emissions of this signal.
| token |
the interface or part of an interface in which clients are newly interested |