[gtk+] GtkGrid: Add a note about overlapping children

[Matthias Clasen <matthiasc src gnome org>]

commit 0c6d158373fad108658481cf1f45a7136be6fa3b
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Apr 28 02:19:45 2012 -0400

    GtkGrid: Add a note about overlapping children
    
    https://bugzilla.gnome.org/show_bug.cgi?id=669989

 gtk/gtkgrid.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkgrid.c b/gtk/gtkgrid.c
index 8a96e82..03a0976 100644
--- a/gtk/gtkgrid.c
+++ b/gtk/gtkgrid.c
@@ -42,7 +42,8 @@
  *
  * Children are added using gtk_grid_attach(). They can span multiple
  * rows or columns. It is also possible to add a child next to an
- * existing child, using gtk_grid_attach_next_to().
+ * existing child, using gtk_grid_attach_next_to(). The behaviour of
+ * GtkGrid when several children occupy the same grid cell is undefined.
  *
  * GtkGrid can be used like a #GtkBox by just using gtk_container_add(),
  * which will place children next to each other in the direction determined