[gtk+] gtkwindow: Don't set the background if the window is app-paintable

[Jasper St. Pierre <jstpierre src gnome org>]

commit a34a0224e4fc6eff35fd41b7f318517b20b95713
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Feb 13 18:21:42 2015 -0800

    gtkwindow: Don't set the background if the window is app-paintable
    
    This fixes transparent DND windows.

 gtk/gtkwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 4dbde2a..2b1bcca 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -7006,7 +7006,7 @@ gtk_window_realize (GtkWidget *widget)
   /* We don't need to set a background on the GdkWindow; with decorations
    * we draw the background ourself
    */
-  if (!priv->client_decorated)
+  if (!priv->client_decorated && !gtk_widget_get_app_paintable (widget))
     gtk_style_context_set_background (gtk_widget_get_style_context (widget), gdk_window);
 
   attributes.x = allocation.x;