Check TpChannel's group signals fire exactly once per change.
Check TpChannel's group signals fire exactly once per change.

If the group channel has the Members_Changed_Detailed flag, then
TpChannel should only listen to the new signal; if not, it should only
listen to the former. Regardless, both GObject signals should fire
exactly once per change.

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