def nodesConnected(self, fromDagNode, toDagNode):
        self.dag.connectNodes(fromDagNode, toDagNode)
        self.updateScenegraph(self.selectedDagNodes())
When the user interface connects two nodes, tell the in-flight dag
dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_main_window.py/MainWindow.nodesConnected