[gnome-themes-standard] column-header: add a style for dragged column headers

[Cosimo Cecchi <cosimoc src gnome org>]

commit 8b2fe7e8379eaaa7e83841d1837ab740a4fc76fa
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Nov 24 15:57:50 2012 -0500

    column-header: add a style for dragged column headers
    
    Based on a patch by Stefano Facchini <stefano facchini gmail com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=684982

 .../Adwaita/gtk-3.0/gtk-widgets-borders-dark.css   |    3 ++-
 themes/Adwaita/gtk-3.0/gtk-widgets-borders.css     |    3 ++-
 themes/Adwaita/gtk-3.0/gtk-widgets.css             |    9 +++++++++
 3 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/themes/Adwaita/gtk-3.0/gtk-widgets-borders-dark.css b/themes/Adwaita/gtk-3.0/gtk-widgets-borders-dark.css
index 678c3c3..6f25a22 100644
--- a/themes/Adwaita/gtk-3.0/gtk-widgets-borders-dark.css
+++ b/themes/Adwaita/gtk-3.0/gtk-widgets-borders-dark.css
@@ -149,7 +149,8 @@ column-header .button,
 column-header.button:active,
 column-header .button:active,
 column-header.button:active:hover,
-column-header .button:active:hover {
+column-header .button:active:hover,
+column-header .button.dnd {
     border-image: linear-gradient(to top,
                                   @borders,
                                   @theme_base_color
diff --git a/themes/Adwaita/gtk-3.0/gtk-widgets-borders.css b/themes/Adwaita/gtk-3.0/gtk-widgets-borders.css
index f28c6f9..e1af847 100644
--- a/themes/Adwaita/gtk-3.0/gtk-widgets-borders.css
+++ b/themes/Adwaita/gtk-3.0/gtk-widgets-borders.css
@@ -149,7 +149,8 @@ column-header .button,
 column-header.button:active,
 column-header .button:active,
 column-header.button:active:hover,
-column-header .button:active:hover {
+column-header .button:active:hover,
+column-header .button.dnd {
     border-image: linear-gradient(to top,
                                   mix(@borders, @theme_base_color, 0.5),
                                   @theme_base_color
diff --git a/themes/Adwaita/gtk-3.0/gtk-widgets.css b/themes/Adwaita/gtk-3.0/gtk-widgets.css
index 69b07a9..a3979b5 100644
--- a/themes/Adwaita/gtk-3.0/gtk-widgets.css
+++ b/themes/Adwaita/gtk-3.0/gtk-widgets.css
@@ -3225,6 +3225,15 @@ column-header .button *:active:hover {
     icon-shadow: none;
 }
 
+column-header .button.dnd {
+    background-color: transparent;
+    background-image: linear-gradient(to bottom,
+                                      shade(@theme_base_color, 0.97),
+                                      @theme_base_color);
+    border-width: 0 1px;
+    border-image-slice: 0 1;
+}
+
 row:hover {
     border-width: 0;
 }