[pitivi] undo: Nicer debug display for MetaChangedAtions

[Alexandru Băluț <alexbalut src gnome org>]

commit bddab245a4aa805a31ba6262ec585d6569b74b8b
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sat Apr 1 15:11:57 2017 +0200

    undo: Nicer debug display for MetaChangedAtions

 pitivi/undo/undo.py | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/pitivi/undo/undo.py b/pitivi/undo/undo.py
index 8e7ec0f19..000ef1bdd 100644
--- a/pitivi/undo/undo.py
+++ b/pitivi/undo/undo.py
@@ -438,6 +438,9 @@ class MetaChangedAction(UndoableAutomaticObjectAction):
         self.old_value = current_value
         self.new_value = new_value
 
+    def __repr__(self):
+        return "<MetaChangedAction %s.%s: %s -> %s>" % (self.auto_object, self.item, self.old_value, 
self.new_value)
+
     def do(self):
         self.auto_object.set_meta(self.item, self.new_value)