Multi-headed graphs with loops starting at first node fail to render #3536
Description
The following script creates a flow graph with two disjoint groups, both of them small loops:
f = FlowGraph()
a = FlowGraphNode(f)
b = FlowGraphNode(f)
f.append(a)
f.append(b)
a.add_outgoing_edge(BranchType.UnconditionalBranch, b)
b.add_outgoing_edge(BranchType.UnconditionalBranch, a)
a = FlowGraphNode(f)
b = FlowGraphNode(f)
f.append(a)
f.append(b)
a.add_outgoing_edge(BranchType.UnconditionalBranch, b)
b.add_outgoing_edge(BranchType.UnconditionalBranch, a)
bv.show_graph_report("two loops", f)The graph shown is not rendered correctly, and the following errors are printed to the log:
Node 2 is not present in the layout data
Node 3 is not present in the layout data
Node 2 not processed in layout
Node 3 not processed in layout