[gtk+/gtk-style-context] Add #define for the "spinner" style class

[Carlos Garnacho <carlosg src gnome org>]

commit efa528159e398b68795fd4d9e87c6cec2675af00
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Nov 24 23:00:47 2010 +0100

    Add #define for the "spinner" style class

 gtk/gtkstylecontext.h  |    7 +++++++
 gtk/gtkthemingengine.c |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkstylecontext.h b/gtk/gtkstylecontext.h
index 05322dd..43f3893 100644
--- a/gtk/gtkstylecontext.h
+++ b/gtk/gtkstylecontext.h
@@ -283,6 +283,13 @@ struct _GtkStyleContextClass
  */
 #define GTK_STYLE_CLASS_PROGRESSBAR "progressbar"
 
+/**
+ * GTK_STYLE_CLASS_SPINNER:
+ *
+ * A widget class defining a spinner
+ */
+#define GTK_STYLE_CLASS_SPINNER "spinner"
+
 /* Predefined set of widget regions */
 
 /**
diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index e5df624..e16dc03 100644
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -2612,7 +2612,7 @@ gtk_theming_engine_render_activity (GtkThemingEngine *engine,
                                     gdouble           width,
                                     gdouble           height)
 {
-  if (gtk_theming_engine_has_class (engine, "spinner"))
+  if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
     {
       GtkStateFlags state;
       guint num_steps, step;