[cluttermm] Add a TODO comment.

[Murray Cumming <murrayc src gnome org>]

commit b79cfc818a92a558f834ad7f87237016f9476ebf
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Mar 26 09:53:27 2014 +0100

    Add a TODO comment.

 clutter/src/types.hg |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/clutter/src/types.hg b/clutter/src/types.hg
index 209be7b..dcec94f 100644
--- a/clutter/src/types.hg
+++ b/clutter/src/types.hg
@@ -139,6 +139,8 @@ public:
 
   _WRAP_EQUAL(cluttermm_rect_equals)
 
+  //TODO: Is this useful? And should it be const?
+  //All methods normalise the rect anyway.
   _WRAP_METHOD(Rect normalise(), clutter_rect_normalize)
 
   /** Retrieves the center of the rect and returns a rect with the correct coordinates.