[pitivi] interpolator: Do not allow removing a keyframe that don't belong to us

[Thibault Saunier <tsaunier src gnome org>]

commit fbc7504ff1b4960941ef6a09555f1558b8b17256
Author: Thibault Saunier <thibault saunier collabora co uk>
Date:   Sun May 22 21:57:04 2011 -0400

    interpolator: Do not allow removing a keyframe that don't belong to us

 pitivi/timeline/track.py |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/timeline/track.py b/pitivi/timeline/track.py
index b6b0196..2d1c841 100644
--- a/pitivi/timeline/track.py
+++ b/pitivi/timeline/track.py
@@ -219,6 +219,10 @@ class Interpolator(Signallable, Loggable):
         return keyframe
 
     def removeKeyframe(self, keyframe):
+        if keyframe not in self._keyframes:
+            self.debug("This keyframe doesn't belong to me")
+            return
+
         old_value = self._controller.get(self._property.name, keyframe.time)
         self._controller.unset(self._property.name, keyframe.time)
         if keyframe is not self.start and keyframe is not self.end: