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The process-graph should only be concerned with GraphNodes, which may or may not be Routes. This also removes intrinsic connection information from the graph-node. Connection information is to be kept separate from the nodes. When the graph is re-calculated in the background, old information has to be retained until the new graph becomes active. Previously *new* information was already stored in the nodes while the graph is sorted, even though the new graph was not active.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html