[pitivi] timeline/track: actually set _update_transitions when we enable or disable updates.

[Edward Hervey <edwardrv src gnome org>]

commit 280d4b86ca1d1dc6a7d6be60c1ad1e3a376ee4b0
Author: Alessandro Decina <alessandro d gmail com>
Date:   Thu Sep 9 15:21:01 2010 +0200

    timeline/track: actually set _update_transitions when we enable or disable updates.

 pitivi/timeline/track.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/timeline/track.py b/pitivi/timeline/track.py
index d56ba23..065b93b 100644
--- a/pitivi/timeline/track.py
+++ b/pitivi/timeline/track.py
@@ -1136,10 +1136,12 @@ class Track(Signallable, Loggable):
     def enableUpdates(self):
         self.composition.props.update = True
         self.updateDefaultSources()
+        self._update_transitions = True
         self.updateTransitions()
 
     def disableUpdates(self):
         self.composition.props.update = False
+        self._update_transitions = False
 
     def addTransition(self, transition):
         a, b = transition.a, transition.b