[gtkmm] Add a TODO about Widget::reparent().

[Murray Cumming <murrayc src gnome org>]

commit a502d27364572430c2deb3f0a56cbfb0e5c48a19
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Jun 6 17:31:43 2014 +0200

    Add a TODO about Widget::reparent().

 gtk/src/widget.hg |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/src/widget.hg b/gtk/src/widget.hg
index fd5181a..5a0f82c 100644
--- a/gtk/src/widget.hg
+++ b/gtk/src/widget.hg
@@ -178,6 +178,8 @@ public:
   _WRAP_METHOD(bool send_focus_change(GdkEvent* event), gtk_widget_send_focus_change)
   _WRAP_METHOD(bool activate(), gtk_widget_activate)
 
+  //TODO: Maybe keep this or implement it ourselves,
+  //because the C API now requires manual ref/unrefing to stop remove() and add() from breaking things.
   _WRAP_METHOD(void reparent(Widget& new_parent), gtk_widget_reparent, deprecated "Use Container::remove() 
and Container::add() instead.")
 
   bool intersect(const Gdk::Rectangle& area) const;