Sends a message in the context of this conversation. Shorthand
        for `telethon.client.messages.MessageMethods.send_message` with
        ``entity`` already set.

async def send_message(self, *args, **kwargs):
        """
        Sends a message in the context of this conversation. Shorthand
        for `telethon.client.messages.MessageMethods.send_message` with
        ``entity`` already set.
        """
        message = await self._client.send_message(
            self._input_chat, *args, **kwargs)

        self._outgoing.add(message.id)
        self._last_outgoing = message.id
        return message