[gtk+] Add annotations to gtk_window_get_position

[Matthias Clasen <matthiasc src gnome org>]

commit ddc588236b5e920e7186d2e1a800bf67ce4daae0
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Mar 12 21:25:07 2011 -0500

    Add annotations to gtk_window_get_position
    
    Part of bug 644353, patch by Ulrik Sverdrup.

 gtk/gtkwindow.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 31590a8..6d42d42 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -4277,14 +4277,16 @@ gtk_window_move (GtkWindow *window,
 /**
  * gtk_window_get_position:
  * @window: a #GtkWindow
- * @root_x: (out): return location for X coordinate of gravity-determined reference point
- * @root_y: (out): return location for Y coordinate of gravity-determined reference point
+ * @root_x: (out) (allow-none): eturn location for X coordinate of
+ *     gravity-determined reference point, or %NULL
+ * @root_y: (out) (allow-none): return location for Y coordinate of
+ *     gravity-determined reference point, or %NULL
  *
  * This function returns the position you need to pass to
- * gtk_window_move() to keep @window in its current position.  This
- * means that the meaning of the returned value varies with window
- * gravity. See gtk_window_move() for more details.
- * 
+ * gtk_window_move() to keep @window in its current position.
+ * This means that the meaning of the returned value varies with
+ * window gravity. See gtk_window_move() for more details.
+ *
  * If you haven't changed the window gravity, its gravity will be
  * #GDK_GRAVITY_NORTH_WEST. This means that gtk_window_get_position()
  * gets the position of the top-left corner of the window manager