Correctly sync state of wx toolbar buttons when triggered by keyboard.

Previously, pressing "p" would unclick the "Pan" button if it was
already pressed, but not press it if it wasn't (even though it did
correctly start panning).  Fix that.

Author: anntzer

lib/matplotlib/backends/backend_wx.py

@@ -1179,12 +1179,14 @@ def get_canvas(self, frame, fig):
         return type(self.canvas)(frame, -1, fig)
 
     def zoom(self, *args):
-        self.ToggleTool(self.wx_ids['Pan'], False)
-        NavigationToolbar2.zoom(self, *args)
+        tool = self.wx_ids['Zoom']
+        self.ToggleTool(tool, not self.GetToolState(tool))
+        super().zoom(*args)
 
     def pan(self, *args):
-        self.ToggleTool(self.wx_ids['Zoom'], False)
-        NavigationToolbar2.pan(self, *args)
+        tool = self.wx_ids['Pan']
+        self.ToggleTool(tool, not self.GetToolState(tool))
+        super().pan(*args)
 
     def save_figure(self, *args):
         # Fetch the required filename and file type.