FIX: Flush events when closing figure on macosx

greglucas · greglucas · commit 0822fd0f0cad · 2022-05-18T19:31:41.000-06:00
Running the macosx backend without calling show() would cause
Timers to pile up and not fire because the event loop was not running.
This leaked objects when closing/opening multiple figures. To fix this,
we start the event loop momentarily before destroying the figure.
diff --git a/lib/matplotlib/backends/backend_macosx.py b/lib/matplotlib/backends/backend_macosx.py
@@ -152,6 +152,12 @@ def close(self):
         Gcf.destroy(self)
         self.canvas.flush_events()
 
+    def destroy(self):
+        # We need to run the event loop briefly to clear any
+        # pending timers and free those objects
+        self.canvas.start_event_loop(0.01)
+        super().destroy()
+
     def show(self):
         if not self._shown:
             self._show()
