[gnome-panel] na: copy a fix from gnome-shell

[Vincent Untz <vuntz src gnome org>]

commit cda7d96e13edd9ca8539b303d77d79ddffca5a1f
Author: Dan Winship <danw gnome org>
Date:   Mon Feb 7 10:09:15 2011 -0500

    na: copy a fix from gnome-shell
    
    gdk_window_set_background_pattern()'s behavior has changed; use cairo
    drawing functions instead.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=614711

 applets/notification_area/na-tray-child.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/applets/notification_area/na-tray-child.c b/applets/notification_area/na-tray-child.c
index 84316a6..1042940 100644
--- a/applets/notification_area/na-tray-child.c
+++ b/applets/notification_area/na-tray-child.c
@@ -53,9 +53,10 @@ na_tray_child_realize (GtkWidget *widget)
        * extension. */
 
       /* Set a transparent background */
-      GdkColor transparent = { 0, 0, 0, 0 }; /* only pixel=0 matters */
-      gdk_window_set_background (window, &transparent);
+      cairo_pattern_t *transparent = cairo_pattern_create_rgba (0, 0, 0, 0);
+      gdk_window_set_background_pattern (window, transparent);
       gdk_window_set_composited (window, TRUE);
+      cairo_pattern_destroy (transparent);
 
       child->parent_relative_bg = FALSE;
     }