wx: Fix saving after window is closed.

QuLogic · QuLogic · commit 6cbae5dda067 · 2020-05-13T00:34:09.000-04:00
We don't need to run `gui_repaint` if the window is gone, so just skip
it.
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
@@ -623,7 +623,9 @@ def gui_repaint(self, drawDC=None, origin='WX'):
         The 'WXAgg' backend sets origin accordingly.
         """
         _log.debug("%s - gui_repaint()", type(self))
-        if self.IsShownOnScreen():
+        # The "if self" check avoids a "wrapped C/C++ object has been deleted"
+        # RuntimeError if doing things after window is closed.
+        if self and self.IsShownOnScreen():
             if not drawDC:
                 # not called from OnPaint use a ClientDC
                 drawDC = wx.ClientDC(self)
