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Clamp the "to" token for /rooms/{roomId}/messages to when the user left
the room. There isn't a way for the client to learn a valid "to" token for a room that they have left in the C-S API but that doesn't stop a client making one up.
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@ -120,6 +120,10 @@ class MessageHandler(BaseHandler):
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if source_config.direction == "f":
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if source_config.to_key is None:
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source_config.to_key = str(leave_token)
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else:
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to_token = RoomStreamToken.parse(source_config.to_key)
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if leave_token.topological < to_token.topological:
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source_config.to_key = str(leave_token)
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yield self.hs.get_handlers().federation_handler.maybe_backfill(
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room_id, room_token.topological
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