[kupfer] grouping: Define repr_key

[Ulrik Sverdrup <usverdrup src gnome org>]

commit c6ecae4c12e67f72db1be67a29fa0509c49bd486
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Thu Jan 14 17:02:11 2010 +0100

    grouping: Define repr_key

 kupfer/obj/grouping.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/obj/grouping.py b/kupfer/obj/grouping.py
index 30332bc..e61ad12 100644
--- a/kupfer/obj/grouping.py
+++ b/kupfer/obj/grouping.py
@@ -175,5 +175,8 @@ class _GroupedItemsSource(Source):
 		for leaf in self._leaf.links:
 			yield leaf
 
+	def repr_key(self):
+		return repr(self._leaf)
+