[glibmm] ObjectBase: move operations: Call the sigc::trackable base.

[Murray Cumming <murrayc src gnome org>]

commit ab8f9d8a6aac54d1b57eb6455dcdcb92c59d7009
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Sep 1 17:00:54 2015 +0200

    ObjectBase: move operations: Call the sigc::trackable base.

 glib/glibmm/objectbase.cc |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/glib/glibmm/objectbase.cc b/glib/glibmm/objectbase.cc
index 96fba70..1a1f522 100644
--- a/glib/glibmm/objectbase.cc
+++ b/glib/glibmm/objectbase.cc
@@ -113,13 +113,16 @@ void ObjectBase::initialize_move(GObject* castitem, Glib::ObjectBase* previous_w
 }
 
 ObjectBase::ObjectBase(ObjectBase&& src) noexcept
-: gobject_(std::move(src.gobject_)),
+: sigc::trackable(std::move(src)),
+  gobject_(std::move(src.gobject_)),
   custom_type_name_(std::move(src.custom_type_name_)),
   cpp_destruction_in_progress_(std::move(src.custom_type_name_))
 {}
 
 ObjectBase& ObjectBase::operator=(ObjectBase&& src) noexcept
 {
+  sigc::trackable::operator=(std::move(src));
+
   if(gobject_)
     unreference();