Muc channels should implement the GroupFlags property and friend to allow tp-glib's client code to retrieve them in a more efficent way. http://telepathy.freedesktop.org/spec/org.freedesktop.Telepathy.Channel.Interface.Group.html#properties
Hum I wrongly understood this error: (empathy:16609): tp-glib/groups-DEBUG: tp_channel_got_group_properties_cb: Got group properties, but no Properties flag: assuming a broken implementation and falling back to 0.16 API These properties *are* implemented but Salut don't claim they are as TP_CHANNEL_GROUP_FLAG_PROPERTIES is not set.
Should be fixed in http://git.collabora.co.uk/?p=user/cassidy/telepathy-salut;a=shortlog;h=refs/heads/muc-properties-27289
Looks good to me.
Fixed in git for 0.3.12
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