MNT: Call close() up the inheritance chain

pyqtgraph/widgets/GraphicsView.py

@@ -165,7 +165,8 @@ class GraphicsView(QtGui.QGraphicsView):
         self.sceneObj = None
         self.closed = True
         self.setViewport(None)
-        
+        super(GraphicsView, self).close()
+
     def useOpenGL(self, b=True):
         if b:
             if not HAVE_OPENGL:

pyqtgraph/widgets/PlotWidget.py

@@ -69,7 +69,7 @@ class PlotWidget(GraphicsView):
         #self.scene().clear()
         #self.mPlotItem.close()
         self.setParent(None)
-        GraphicsView.close(self)
+        super(PlotWidget, self).close()
 
     def __getattr__(self, attr):  ## implicitly wrap methods from plotItem
         if hasattr(self.plotItem, attr):