[gtk+] Adwaita: fix column-header backdrop state

[Lapo Calamandrei <lapo src gnome org>]

commit 67b4749be04c3e0827d02884ced1b715f373f71f
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Mon Jun 16 17:07:27 2014 +0200

    Adwaita: fix column-header backdrop state

 gtk/resources/theme/Adwaita/_common.scss           |    2 ++
 gtk/resources/theme/Adwaita/gtk-contained-dark.css |    2 ++
 gtk/resources/theme/Adwaita/gtk-contained.css      |    2 ++
 3 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/resources/theme/Adwaita/_common.scss b/gtk/resources/theme/Adwaita/_common.scss
index d382b09..d92d70e 100644
--- a/gtk/resources/theme/Adwaita/_common.scss
+++ b/gtk/resources/theme/Adwaita/_common.scss
@@ -684,6 +684,8 @@ column-header {
   }
   &:backdrop {
     border-color: $backdrop_bg_color;
+    border-width: 0 1px 1px 0;
+    color: mix($backdrop_fg_color, $backdrop_bg_color,50%);
     background-image: none;
     &:insensitive {
       border-color: $backdrop_bg_color;
diff --git a/gtk/resources/theme/Adwaita/gtk-contained-dark.css 
b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
index bd2e573..8090cd2 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
@@ -867,6 +867,8 @@ column-header .button, column-header .button:hover, column-header .button:active
     background-image: none; }
   column-header .button:backdrop {
     border-color: #393f3f;
+    border-width: 0 1px 1px 0;
+    color: #818584;
     background-image: none; }
     column-header .button:backdrop:insensitive {
       border-color: #393f3f;
diff --git a/gtk/resources/theme/Adwaita/gtk-contained.css b/gtk/resources/theme/Adwaita/gtk-contained.css
index 3e5c8ba..ab3fe60 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained.css
@@ -867,6 +867,8 @@ column-header .button, column-header .button:hover, column-header .button:active
     background-image: none; }
   column-header .button:backdrop {
     border-color: #ededed;
+    border-width: 0 1px 1px 0;
+    color: #a0a3a3;
     background-image: none; }
     column-header .button:backdrop:insensitive {
       border-color: #ededed;