[pitivi] ruler: Fix dimmed color

[Thibault Saunier <tsaunier src gnome org>]

commit f8be52caad83f112ffab7ec68870726938260b2d
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sat Dec 12 14:43:35 2015 +0100

    ruler: Fix dimmed color
    
    Reviewed-by: Thibault Saunier <tsaunier gnome org>
    Differential Revision: https://phabricator.freedesktop.org/D588

 pitivi/timeline/ruler.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/ruler.py b/pitivi/timeline/ruler.py
index 5e9e079..837905a 100644
--- a/pitivi/timeline/ruler.py
+++ b/pitivi/timeline/ruler.py
@@ -161,7 +161,8 @@ class ScaleRuler(Gtk.DrawingArea, Zoomable, Loggable):
 
         style = self.app.gui.get_style_context()
         color_normal = style.get_color(Gtk.StateFlags.NORMAL)
-        color_insensitive = style.get_color(Gtk.StateFlags.INSENSITIVE)
+        color_insensitive = style.get_color(Gtk.StateFlags.BACKDROP)
+
         self._color_normal = color_normal
         self._color_dimmed = Gdk.RGBA(
             *[(x * 3 + y * 2) / 5