[gtk+] widget: don't call gtk_style_context_set_background if app_paintable

[Cosimo Cecchi <cosimoc src gnome org>]

commit 9b47bc5c95cd2aa18abcb476febe2fc39fbc30c3
Author: Benjamin Otte <otte redhat com>
Date:   Mon Jun 18 10:28:52 2012 -0400

    widget: don't call gtk_style_context_set_background if app_paintable
    
    When a widget is app_paintable, its background should not be drawn by
    the theme, thus we should not try to override its background again when
    style-updated is fired.
    This is a bit of a hack, but it fixes gray surfaces observed for DnD
    windows with recent GTK+.

 gtk/gtkwidget.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 63ad565..1f93340 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -6710,7 +6710,8 @@ gtk_widget_real_style_updated (GtkWidget *widget)
   if (widget->priv->context)
     {
       if (gtk_widget_get_realized (widget) &&
-          gtk_widget_get_has_window (widget))
+          gtk_widget_get_has_window (widget) &&
+          !gtk_widget_get_app_paintable (widget))
         gtk_style_context_set_background (widget->priv->context,
                                           widget->priv->window);
     }