[gtk+/gtk-2-24] win32: Fix vertical GtkVolumeButton widget rendering.

[Dieter Verfaillie <dieterv src gnome org>]

commit 60d471b2d00ce3a42e017a333fa4518429aacd93
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Wed Dec 7 12:50:34 2011 +0100

    win32: Fix vertical GtkVolumeButton widget rendering.
    
    The trough was being rendered horizontal for vertical
    GtkVolumeButton widgets. Not relying on GTK_IS_VSCALE
    but using the orientable interface instead fixes this.

 modules/engines/ms-windows/msw_style.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/modules/engines/ms-windows/msw_style.c b/modules/engines/ms-windows/msw_style.c
index 7c35281..afd1a40 100755
--- a/modules/engines/ms-windows/msw_style.c
+++ b/modules/engines/ms-windows/msw_style.c
@@ -2033,7 +2033,9 @@ draw_box (GtkStyle *style,
 	}
       else if (widget && GTK_IS_SCALE (widget))
 	{
-	  gboolean is_vertical = GTK_IS_VSCALE (widget);
+          GtkOrientation orientation;
+
+          orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
 
 	  if (!xp_theme_is_active ())
 	    {
@@ -2042,7 +2044,7 @@ draw_box (GtkStyle *style,
 				      widget, detail, x, y, width, height);
 	    }
 
-	  if (is_vertical)
+	  if (orientation == GTK_ORIENTATION_VERTICAL)
 	    {
 	      if (xp_theme_draw
 		  (window, XP_THEME_ELEMENT_SCALE_TROUGH_V,