[pitivi: 14/16] Put back bits of 12b1a30974f081ed034910e98990480c1546a26c that i accidentally reverted in 477d039fbb

[Edward Hervey <edwardrv src gnome org>]

commit bf5e65909854ed87c98a8c3bfe6bce6f4387171d
Author: Alessandro Decina <alessandro d gmail com>
Date:   Sat Jul 4 10:06:28 2009 +0200

    Put back bits of 12b1a30974f081ed034910e98990480c1546a26c that i accidentally reverted in 477d039fbb05f5aeb4a21582be8ce7d23d835623. Oops.

 pitivi/timeline/timeline.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 16122b0..ba6c83f 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -105,8 +105,8 @@ class TimelineObject(Signallable, Loggable):
         other = cls(self.factory)
         other.track_objects = []
         if copy_track_objects:
-            other.track_objects.extend(track_object.copy() for track_object in
-                    self.track_objects)
+            for track_object in self.track_objects:
+                other.addTrackObject(track_object.copy())
 
         return other