Avoid "wrapped C/C++ object has been deleted" when closing wx window.

anntzer · anntzer · commit 276c7efe5851 · 2020-04-11T14:06:54.000+02:00
A RuntimeError is otherwise triggered when closing a wx window by clicking the "x" button on the top right. Bisects to bce6263 which fixed another issue with wx...
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
@@ -1058,7 +1058,9 @@ def show(self):
     def destroy(self, *args):
         # docstring inherited
         _log.debug("%s - destroy()", type(self))
-        self.frame.Close()
+        frame = self.frame
+        if frame:  # Else, may have been already deleted, e.g. when closing.
+            frame.Close()
         wxapp = wx.GetApp()
         if wxapp:
             wxapp.Yield()
