wx: Fix the zoom rubberband with toolmanager

Author: QuLogic

lib/matplotlib/backends/backend_wx.py

@@ -1152,7 +1152,7 @@ def save_figure(self, *args):
 
     def draw_rubberband(self, event, x0, y0, x1, y1):
         height = self.canvas.figure.bbox.height
-        sf = 1 if wx.Platform == '__WXMSW__' else self.GetDPIScaleFactor()
+        sf = 1 if wx.Platform == '__WXMSW__' else self.canvas.GetDPIScaleFactor()
         self.canvas._rubberband_rect = (x0/sf, (height - y0)/sf,
                                         x1/sf, (height - y1)/sf)
         self.canvas.Refresh()