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.
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