BUG: Force osx canvas to flush events on draw() (Fixes #9491)

dopplershift · dopplershift · commit 75aa1430a347 · 2017-10-20T14:36:25.000-06:00
draw() needs to ensure events are flushed before returning, so do so
(that's the difference between draw and draw_idle). It turns out
flush_event wasn't being used up to this point.
diff --git a/lib/matplotlib/backends/backend_macosx.py b/lib/matplotlib/backends/backend_macosx.py
@@ -104,6 +104,7 @@ def _draw(self):
 
     def draw(self):
         self.invalidate()
+        self.flush_events()
 
     def draw_idle(self, *args, **kwargs):
         self.invalidate()
