79330f909e
If connecting ports using the port-engine fails, ardour forgets the connection. Internal backends only produced an error if a port was already connected, when using ::connect (handle, other), but ignore already existing connection when using port-names. Various ports are connected twice when the engine connects at session load. This worked fine for as long as the engine was never stopped (saving the session asks the port-engine), but failed when the engine went away and internal representation is used.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html