From ae1c0c32a8ae463d144d81084fd6f1cdf50e643b Mon Sep 17 00:00:00 2001
From: Philip Withnall <philip@tecnocode.co.uk>
Date: Thu, 22 Aug 2013 21:11:29 +0000
Subject: Optimise set_show_hints()

Only redraw the drawing area if something’s actually changed.
---
diff --git a/PascalTriangle.activity/pascaltriangle.py b/PascalTriangle.activity/pascaltriangle.py
index d5c3b6b..083693d 100644
--- a/PascalTriangle.activity/pascaltriangle.py
+++ b/PascalTriangle.activity/pascaltriangle.py
@@ -456,8 +456,9 @@ class PascalTriangleActivity(activity.Activity):
 
     def set_show_hints(self, val):
         """Set whether hints should be rendered."""
-        self._show_hints = val
-        self._drawing_area.queue_draw()
+        if self._show_hints != val:
+            self._show_hints = val
+            self._drawing_area.queue_draw()
 
     show_hints = property(get_show_hints, set_show_hints)
 
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