[pitivi] UI: Adjust Viewer DAR whenever the project settings change. Fixes #572099

[Edward Hervey <edwardrv src gnome org>]

commit 019cc43d0989cf549251c3aeac7259f750feb6c7
Author: Edward Hervey <bilboed bilboed com>
Date:   Tue May 12 18:50:32 2009 +0200

    UI: Adjust Viewer DAR whenever the project settings change. Fixes #572099
---
 pitivi/ui/mainwindow.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/pitivi/ui/mainwindow.py b/pitivi/ui/mainwindow.py
index 6918d05..b8003f2 100644
--- a/pitivi/ui/mainwindow.py
+++ b/pitivi/ui/mainwindow.py
@@ -750,6 +750,9 @@ class PitiviMainWindow(gtk.Window, Loggable):
     @handler(project, "settings-changed")
     def _settingsChangedCb(self, project):
         self.rate = float(1 / self.project.settings.videorate)
+        if self.viewer.action == self.project.view_action:
+            sett = self.project.getSettings()
+            self.viewer.setDisplayAspectRatio(float(sett.videopar * sett.videowidth) / float(sett.videoheight))
 
     @handler(project, "missing-plugins")
     def _projectMissingPluginsCb(self, project, uri, detail, message):