[pitivi] Use a dark theme variant for GTK3

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

commit 1130ce78c5f91b8e46cbd8756f14a6adf41000d9
Author: Jean-FranÃois Fortin Tam <nekohayo gmail com>
Date:   Mon Jul 30 12:54:38 2012 +0200

    Use a dark theme variant for GTK3
    
    Fixes bug #676504

 pitivi/mainwindow.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/mainwindow.py b/pitivi/mainwindow.py
index e9c477f..7f6619b 100644
--- a/pitivi/mainwindow.py
+++ b/pitivi/mainwindow.py
@@ -180,6 +180,8 @@ class PitiviMainWindow(gtk.Window, Loggable):
     """
     def __init__(self, instance, allow_full_screen=True):
         """ initialize with the Pitivi object """
+        gtksettings = gtk.Settings.get_default()
+        gtksettings.set_property("gtk-application-prefer-dark-theme", True)
         gtk.Window.__init__(self)
         Loggable.__init__(self, "mainwindow")
         self.app = instance