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1b1ed1a
(Get the code!)
A fix is available in the branch https:/
It will be merged in trunk soon.
As Olivier pointed out, the problem was indeed that we rendered subflows multiple times (as graphviz clusters, and inside different other clusters) when they occured multiple times. The fix renders completely each sublow only once and create a green node specifying the name of the sublfow when it would be otherwise repeated.