[pitivi] elements:previewer: Use the TrackElement duration to compute thumbnails duration

[Thibault Saunier <tsaunier src gnome org>]

commit 83b04dcb01d90a027b134cffcc0df525ad809bd6
Author: Thibault Saunier <tsaunier gnome org>
Date:   Mon Jun 8 19:37:14 2015 +0200

    elements:previewer: Use the TrackElement duration to compute thumbnails duration
    
    In the case of splitting the negotiated rectangle does not have the
    right width at that point, also avoid converting from Pixels to Ns
    for nothing.

 pitivi/timeline/previewers.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/previewers.py b/pitivi/timeline/previewers.py
index 679c531..87b7d86 100644
--- a/pitivi/timeline/previewers.py
+++ b/pitivi/timeline/previewers.py
@@ -388,7 +388,7 @@ class VideoPreviewer(Gtk.Layout, PreviewGenerator, Zoomable, Loggable):
         thumb_duration = self._get_thumb_duration()
 
         element_left = self.pixelToNs(rect.x) + self.bElement.props.in_point
-        element_right = element_left + self.pixelToNs(rect.width)
+        element_right = element_left + self.bElement.props.duration
         element_left = quantize(element_left, thumb_duration)
 
         for current_time in range(element_left, element_right, thumb_duration):