[gtk+] print dialog: Use an element name for rendering the paper

[Matthias Clasen <matthiasc src gnome org>]

commit 59c1547a4879d3ca57e7e4c35e12ec8021a0ef58
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 7 00:57:03 2015 -0500

    print dialog: Use an element name for rendering the paper
    
    Use a transient node with name paper instead of a random
    collection of style classes for rendering the papers.

 gtk/gtkprintunixdialog.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkprintunixdialog.c b/gtk/gtkprintunixdialog.c
index 3f7d6eb..71b2101 100644
--- a/gtk/gtkprintunixdialog.c
+++ b/gtk/gtkprintunixdialog.c
@@ -56,6 +56,7 @@
 #include "gtkprivate.h"
 #include "gtktypebuiltins.h"
 #include "gtkdialogprivate.h"
+#include "gtkstylecontextprivate.h"
 
 
 /**
@@ -2223,10 +2224,7 @@ paint_page (GtkWidget *widget,
 
   context = gtk_widget_get_style_context (widget);
 
-  gtk_style_context_save (context);
-  gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
-  gtk_style_context_add_class (context, GTK_STYLE_CLASS_PAPER);
-  gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);
+  gtk_style_context_save_named (context, "paper");
 
   gtk_render_background (context, cr, x, y, width, height);
   gtk_render_frame (context, cr, x, y, width, height);