When joining a chatroom with a lot of people, Gabble emits a lot of signals "MembersChanged" on the group interface (org.freedesktop.Telepathy.Channel.Interface.Group). The signal is emitted by tp_group_mixin_change_members() from src/gabble-muc-channel.c. We should aggregate contacts and emit only one MembersChanged signal.
Fixed in darcs, will be in 0.7.4
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