[gnome-panel/wip/segeiger/css-transparent-show-desktop-button] CSS: Fix transparency for show desktop button on Adwaita theme

[Sebastian Geiger <segeiger src gnome org>]

commit 60a178c893d06c25fa5b7b5a368699465ed0a8ff
Author: Sebastian Geiger <sbastig gmx net>
Date:   Sat Jun 6 21:05:15 2015 +0200

    CSS: Fix transparency for show desktop button on Adwaita theme
    
    The show desktop button is now transparent if gnome-panel
    is configured to be transparent. When the showdesktop button
    is active the background color is set to the default background
    color for the theme.

 gnome-panel/Adwaita.css |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gnome-panel/Adwaita.css b/gnome-panel/Adwaita.css
index bf51ed8..53442c5 100644
--- a/gnome-panel/Adwaita.css
+++ b/gnome-panel/Adwaita.css
@@ -35,6 +35,14 @@ PanelApplet GtkButton#showdesktop-button {
        border-radius: 0;
 }
 
+PanelApplet GtkToggleButton#showdesktop-button:checked {
+    background: @theme_selected_bg_color;
+}
+
+PanelApplet GtkToggleButton#showdesktop-button {
+    background: transparent;
+}
+
 WnckPager:selected {
        background-color: @theme_selected_bg_color;
 }