[kupfer: 20/38] commatrick: Don't allow pushing duplicates to object stack

[Ulrik Sverdrup <usverdrup src gnome org>]

commit f727f20349b3d89584df47e2ab7246582aac6b88
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Fri Jan 15 17:58:20 2010 +0100

    commatrick: Don't allow pushing duplicates to object stack

 kupfer/core/data.py |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/kupfer/core/data.py b/kupfer/core/data.py
index 1dd89b9..7d884f9 100644
--- a/kupfer/core/data.py
+++ b/kupfer/core/data.py
@@ -793,8 +793,9 @@ class DataController (gobject.GObject, pretty.OutputMixin):
 		if not self._has_object_stack(pane):
 			return
 		panectl = self._panectl_table[pane]
-		panectl.object_stack_push(object_)
-		self.emit("object-stack-changed", pane)
+		if object_ not in panectl.object_stack:
+			panectl.object_stack_push(object_)
+			self.emit("object-stack-changed", pane)
 		return True
 
 	def object_stack_pop(self, pane):