[pyatspi2] Support negative indices in __getitem__

[Mike Gorse <mgorse src gnome org>]

commit 43eb875be6241906c6772c0b5c39765a8d8261e4
Author: Mike Gorse <mgorse novell com>
Date:   Sat Dec 4 05:40:30 2010 -0500

    Support negative indices in __getitem__

 pyatspi/Accessibility.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/pyatspi/Accessibility.py b/pyatspi/Accessibility.py
index ba1296a..83c18dc 100644
--- a/pyatspi/Accessibility.py
+++ b/pyatspi/Accessibility.py
@@ -23,7 +23,10 @@ from state import *
 from utils import *
 
 def Accessible_getitem(self, i):
-	if i < 0 or i >= self.get_child_count():
+        len=self.get_child_count()
+        if i < 0:
+                i = len + i
+	if i < 0 or i >= len:
 		raise IndexError
 	return self.get_child_at_index(i)