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net: add have_next_message argument to Transport::GetBytesToSend()
Before this commit, there are only two possibly outcomes for the "more" prediction in Transport::GetBytesToSend(): * true: the transport itself has more to send, so the answer is certainly yes. * false: the transport has nothing further to send, but if vSendMsg has more message(s) left, that still will result in more wire bytes after the next SetMessageToSend(). For the BIP324 v2 transport, there will arguably be a third state: * definitely not: the transport has nothing further to send, but even if vSendMsg has more messages left, they can't be sent (right now). This happens before the handshake is complete. To implement this, we move the entire decision logic to the Transport, by adding a boolean to GetBytesToSend(), called have_next_message, which informs the transport whether more messages are available. The return values are still true and false, but they mean "definitely yes" and "definitely no", rather than "yes" and "maybe".
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