[gtk+] Add a style class to fullscreened windows

[Matthias Clasen <matthiasc src gnome org>]

commit 92e52fd18883190ba4b6bf712471172658629f8f
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 26 18:08:46 2014 -0400

    Add a style class to fullscreened windows
    
    This will let us tweak stuff that gets shown in fullscreen windows,
    https://bugzilla.gnome.org/show_bug.cgi?id=654051

 gtk/gtkwindow.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index e905d34..8a5b54b 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -7149,6 +7149,11 @@ update_window_style_classes (GtkWindow *window)
     gtk_style_context_add_class (context, "maximized");
   else
     gtk_style_context_remove_class (context, "maximized");
+
+  if (priv->fullscreen)
+    gtk_style_context_add_class (context, "fullscreen");
+  else
+    gtk_style_context_remove_class (context, "fullscreen");
 }
 
 static void