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Fix membership changes to be idempotent
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@ -85,6 +85,12 @@ class RoomMemberHandler(BaseHandler):
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prev_event_ids=prev_event_ids,
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)
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# Check if this event matches the previous membership event for the user.
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duplicate = yield msg_handler.deduplicate_state_event(event, context)
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if duplicate is not None:
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# Discard the new event since this membership change is a no-op.
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return
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yield msg_handler.handle_new_client_event(
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requester,
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event,
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