23eba1cc392aa5b583ddb4229a227557a88ef1cd
do not allow port-removal if the port would be re-added immediately after that again because the main-delivery actually needs it. As a side effect this prevents this crash: * create a stereo-track, then remove one output -> unhandled exception "AudioEngine::PortRegistrationFailure&" The problem: - the port is removed from the RCU ports list, but Port::drop() (which calls jack_port_unregister) is only called from the Port's destructor at some later time. (because a reference to the port still exists elsewhere) - the jack-port is not yet removed. - meanwhile Delivery::configure_io comes along and notices that there are more audio-buffers than ports and tries to re-register the port. - but the port still exists in jack, so it fails and throws an exception ...which is not handled.
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