[Telepathy] MembersChanged signal

[Benjamin M. Schwartz]

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How do I listen for MembersChanged on  DBus tube? I still do not understand.

Originally, I had
self.tube.add_signal_receiver(self.members_changed,
signal_name="MembersChanged",
dbus_interface="org.freedesktop.Telepathy.Channel.Interface.Group")

I was told that I was listening on the wrong connection.  I changed it to

self.tube.watch_participants(self.members_changed)

This seems to work, but does not provide the helpful
Channel_Group_Change_Reason.  I think I would prefer to listen for
MembersChanged, but I do not know how.

Thank you,
Ben Schwartz
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