Highlight edges with active flows

src/random_generator.rs

@@ -113,6 +113,9 @@ impl MaxflowProblem {
                 let (flow, capacity): (u64, u64) = *e.payload();
                 default_edge_transform(e);
                 e.set_label(format!("{flow}:{capacity}"));
+                if flow > 0 {
+                    e.set_selected(true);
+                }
             }
         );
         graph.node_mut(self.s).expect("node index not found").set_label(String::from("s"));