[gtk+] viewport: Set frame styleclass when getting border size during size allocation

[Alexander Larsson <alexl src gnome org>]

commit 6723feae8a314b806ff783507182208107e08007
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Feb 9 16:36:46 2012 +0100

    viewport: Set frame styleclass when getting border size during size allocation
    
    Without this you don't get the right border/padding for widget->window
    and the border shows up under the scrolled contents.

 gtk/gtkviewport.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkviewport.c b/gtk/gtkviewport.c
index 048d0f6..73238ee 100644
--- a/gtk/gtkviewport.c
+++ b/gtk/gtkviewport.c
@@ -328,9 +328,14 @@ viewport_get_view_allocation (GtkViewport   *viewport,
 
   context = gtk_widget_get_style_context (widget);
   state = gtk_widget_get_state_flags (widget);
+  gtk_style_context_save (context);
+  gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
+
   gtk_style_context_get_padding (context, state, &padding);
   gtk_style_context_get_border (context, state, &border);
 
+  gtk_style_context_restore (context);
+
   if (priv->shadow_type != GTK_SHADOW_NONE)
     {
       view_allocation->x = border.left;