Network: Fix edge delete whene there are multiple edge between two node.

src/View/Network/GraphWidget.py

@@ -457,9 +457,13 @@ class GraphWidget(QGraphicsView):
         self.m_origin_y = 0.0
         self.clicked = False
 
+        self.setup_scene(min_size, max_size, size)
+
+    def setup_scene(self, min_size, max_size, size):
         scene = QGraphicsScene(self)
         scene.setItemIndexMethod(QGraphicsScene.NoIndex)
         scene.setSceneRect(0, 0, 2000, 2000)
+
         self.setScene(scene)
         self.setCacheMode(QGraphicsView.CacheBackground)
         self.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)