ack_message_async

Acknowledge message.

Once the message has been acked, callback will be called. You can then call ack_message_async.end to get the result of the operation.

A message should be acknowledged once it has been shown to the user by the Handler of the channel. So Observers and Approvers should NOT acknowledge messages themselves. Once a message has been acknowledged, it is removed from the pending-message queue and so the pending_message_removed signal is fired.

You should use the SignalledMessage received from dup_pending_messages or the message_received signal.

Parameters:

this	a TextChannel
message	a SignalledMessage
callback	a callback to call when the message have been acked
user_data	data to pass to callback