change_group
Description:
Add or remove the contact from the specified group.
If is_member is true, the contact will be added to the group. If it is false, they will be
removed from the group.
Parameters:
| group |
a freeform group identifier |
| is_member |
whether the contact should be a member of the group |
Exceptions:
| GLib.Error |
if changing the group failed in the backing store |
Since:
0.1.11