fix class reference

richardsheridan · richardsheridan · commit ae96b4f4aa47 · 2020-07-01T15:26:20.000-04:00
diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
@@ -881,10 +881,12 @@ def new_figure_manager_given_figure(cls, num, figure):
     def trigger_manager_draw(manager):
         manager.show()
 
-    @classmethod
-    def mainloop(cls):
+    @staticmethod
+    def mainloop():
         managers = Gcf.get_all_fig_managers()
         if managers:
-            cls._owns_mainloop = True
-            managers[0].window.mainloop()
-            cls._owns_mainloop = False
+            first_manager = managers[0]
+            manager_class = type(first_manager)
+            manager_class._owns_mainloop = True
+            first_manager.window.mainloop()
+            manager_class._owns_mainloop = False
