[gtk+/gtk-2-22] docs: Add paragraph about GdkRegion replacement in GTK3

[Benjamin Otte <otte src gnome org>]

commit 9d2f8f5098a05b530e8125989c63524fc5e38c94
Author: Benjamin Otte <otte redhat com>
Date:   Tue Aug 10 18:25:25 2010 +0200

    docs: Add paragraph about GdkRegion replacement in GTK3
    
    https://bugzilla.gnome.org/show_bug.cgi?id=613284

 docs/reference/gdk/tmpl/regions.sgml |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gdk/tmpl/regions.sgml b/docs/reference/gdk/tmpl/regions.sgml
index dfb43a6..a71a375 100644
--- a/docs/reference/gdk/tmpl/regions.sgml
+++ b/docs/reference/gdk/tmpl/regions.sgml
@@ -82,6 +82,11 @@ Defines the position and size of a rectangle.
 <para>
 A GdkRegion represents a set of pixels on the screen.
 </para>
+<para>
+In GTK3, #GdkRegion will be replaced by #cairo_region_t. All the functions
+listed in this section will go away and you will have to use the relevant
+Cairo functions. The conversion can be done using simple serch and replace.
+</para>
 
 
 <!-- ##### FUNCTION gdk_region_new ##### -->