3d44f39c090005dcbabbd588fbe51a92f8e2966a
This is needed to update the GUI (mixer-strip I/O buttons) when the engine is re-started with different I/O. When Port::reconnect() cannot re-connect the port (e.g. because the corresponding hardware port is missing), the IO object needs o be notified -> PostDisconnect() -> IO::disconnect_check. While the port-manager re-establishes and re-connects port, port_manager->running() == false, and Port::get_connections() returns the Port::_connections set (not actual engine connections). So _connections.clear() has to be called synchronize it with the actual engine connection state.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html
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