[pitivi/ges] viewer: Clear the pipeline bus sync handler to set a new one

[Jean-FranÃois Fortin Tam <jfft src gnome org>]

commit 816a94b55301fb6647d162b7a29cfa1c52edcdc1
Author: Jean-FranÃois Fortin Tam <nekohayo gmail com>
Date:   Wed Mar 7 14:34:40 2012 -0500

    viewer: Clear the pipeline bus sync handler to set a new one

 pitivi/viewer.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/viewer.py b/pitivi/viewer.py
index f86e395..5b73cd3 100644
--- a/pitivi/viewer.py
+++ b/pitivi/viewer.py
@@ -129,6 +129,9 @@ class PitiviViewer(gtk.VBox, Loggable):
         if self.pipeline:
             bus = self.pipeline.get_bus()
             bus.add_signal_watch()
+            # You cannot replace an existing sync_handler.
+            # You can pass NULL to clear it.
+            bus.set_sync_handler(None)
             bus.set_sync_handler(self._elementMessageCb)
             self.pipeline.set_state(gst.STATE_PAUSED)
             self.currentState = gst.STATE_PAUSED