[gtk+] stylecontext: add GTK_STYLE_CLASS_ARROW

[Cosimo Cecchi <cosimoc src gnome org>]

commit c538fb8f6477c4b5cd6fa8fdeb2a2f643f7524c9
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Fri Dec 2 11:57:44 2011 -0500

    stylecontext: add GTK_STYLE_CLASS_ARROW
    
    For e.g. submenu items arrow in GtkMenuItems.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=665420

 docs/reference/gtk/gtk3-sections.txt |    1 +
 gtk/gtkstylecontext.h                |   10 ++++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/gtk3-sections.txt b/docs/reference/gtk/gtk3-sections.txt
index 477bb18..95b5557 100644
--- a/docs/reference/gtk/gtk3-sections.txt
+++ b/docs/reference/gtk/gtk3-sections.txt
@@ -5659,6 +5659,7 @@ GTK_STYLE_CLASS_BOTTOM
 GTK_STYLE_CLASS_LEFT
 GTK_STYLE_CLASS_RIGHT
 GTK_STYLE_CLASS_LINKED
+GTK_STYLE_CLASS_ARROW
 GTK_STYLE_REGION_COLUMN
 GTK_STYLE_REGION_COLUMN_HEADER
 GTK_STYLE_REGION_ROW
diff --git a/gtk/gtkstylecontext.h b/gtk/gtkstylecontext.h
index 547d45e..0dfb476 100644
--- a/gtk/gtkstylecontext.h
+++ b/gtk/gtkstylecontext.h
@@ -686,6 +686,16 @@ struct _GtkStyleContextClass
  */
 #define GTK_STYLE_CLASS_PULSE "pulse"
 
+/**
+ * GTK_STYLE_CLASS_ARROW:
+ *
+ * A CSS class used when rendering an arrow element.
+ *
+ * Note that #gtk_render_arrow automatically adds this style class
+ * to the style context when rendering an arrow element.
+ */
+#define GTK_STYLE_CLASS_ARROW "arrow"
+
 
 GType gtk_style_context_get_type (void) G_GNUC_CONST;