Since it's used for so many things in our specification, TpChannel should have convenience API for the Groups interface. If nothing else, if the local user is removed from a group, until the next time the local user is added to that group, we should remember the removal reason. If the channel is closed while we're remembering a reason, we should use that reason code, with error domain TP_ERRORS_REMOVED_FROM_GROUP, when signalling invalidation of the channel.
Fixed in 0.7.12.
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