PRF: only draw in plt.pause if stale

tacaswell · tacaswell · commit 57bfa346b5f4 · 2015-06-08T09:26:03.000-04:00
Avoids a possibly un-needed re-draw.
diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
@@ -276,7 +276,8 @@ def pause(interval):
         figManager = _pylab_helpers.Gcf.get_active()
         if figManager is not None:
             canvas = figManager.canvas
-            canvas.draw()
+            if canvas.figure.stale:
+                canvas.draw()
             show(block=False)
             canvas.start_event_loop(interval)
             return
