Retrieve the current edge (as a \e top FlowBlock and the index of the outgoing edge). If the end-points have been collapsed together, this returns NULL. The top and bottom nodes of the edge are updated to FlowBlocks in the current collapsed graph. \param outedge will hold the index of the edge (outgoing relative to returned FlowBlock) \param graph is the containing BlockGraph \return the current \
source not stored for this graph (policy: none)
no test coverage detected