[pitivi] previewers: Avoid removing sources already running

[Thibault Saunier <tsaunier src gnome org>]

commit 279b6edf30ac74e19b689fb364fa90a3f6a3be7a
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Wed Apr 30 06:27:16 2014 +0200

    previewers: Avoid removing sources already running
    
    Fixes https://bugzilla.gnome.org/show_bug.cgi?id=726904

 pitivi/timeline/previewers.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/timeline/previewers.py b/pitivi/timeline/previewers.py
index f494483..8f8b4e3 100644
--- a/pitivi/timeline/previewers.py
+++ b/pitivi/timeline/previewers.py
@@ -815,6 +815,7 @@ class AudioPreviewer(Clutter.Actor, PreviewGenerator, Zoomable, Loggable):
                 self._callback_id = GLib.timeout_add(500, self._compute_geometry)
 
     def _compute_geometry(self):
+        self._callback_id = 0
         self.log("Computing the clip's geometry for waveforms")
         self.lastUpdate = datetime.now()
         width_px = self.nsToPixel(self.bElement.props.duration)