merge

rhettinger · rhettinger · commit 569a7fa13a1a · 2014-07-20T21:31:35.000-07:00
diff --git a/Lib/turtle.py b/Lib/turtle.py
@@ -2594,7 +2594,7 @@ def setundobuffer(self, size):
         Example (for a Turtle instance named turtle):
         >>> turtle.setundobuffer(42)
         """
-        if size is None:
+        if size is None or size <= 0:
             self.undobuffer = None
         else:
             self.undobuffer = Tbuffer(size)
