Network, BC: Fix mouseReleaseEvent and contextMenuEvent Exception.

src/View/Network/GraphWidget.py

@@ -736,6 +736,9 @@ class GraphWidget(QGraphicsView):
     def mouseReleaseEvent(self, event):
         self.clicked = False
 
+        if self._only_display:
+            return
+
         if self._state == "move":
             if self._current_moved_node is not None:
                 pos = self.mapToScene(event.pos())
@@ -841,6 +844,9 @@ class GraphWidget(QGraphicsView):
             self.reverse_edge(items[0])
 
     def contextMenuEvent(self, event):
+        if self._only_display:
+            return
+
         pos = self.mapToScene(event.pos())
         items = self.items(event.pos())