network: Fix edge bounding rect.

src/view/network/GraphWidget.py

@@ -132,9 +132,6 @@ class EdgeItem(QGraphicsItem):
 
         self.graph = graph_widget
 
-        self.src_pos = src_node_item.pos()
-        self.dest_pos = dest_node_item.pos()
-
         self.setAcceptedMouseButtons(Qt.NoButton)
         self.adjust()
 
@@ -169,15 +166,20 @@ class EdgeItem(QGraphicsItem):
         extra = (pen_width + 5) / 2.0
 
         return QRectF(
-            self.src_pos,
+            self.src_node.pos(),
             QSizeF(
-                self.dest_pos.x() - self.src_pos.x(),
-                self.dest_pos.y() - self.src_pos.y()
+                self.dest_node.pos().x() - self.src_node.pos().x(),
+                self.dest_node.pos().y() - self.src_node.pos().y()
             )
         ).normalized().adjusted(-extra, -extra, extra, extra)
 
     def paint(self, painter, option, widget):
-        # Draw the line itself.
+        color = QColor(Qt.white)
+        color.setAlpha(128)
+
+        painter.setBrush(color)
+        painter.drawRect(self.boundingRect())
+
         line = QLineF(self.src_node.pos(), self.dest_node.pos())
 
         if line.length() == 0.0: