Added wxPropertyGridConstIterator(const wxPropertyGridIterator&) copy ctor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56527 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgridpagestate.h

@@ -289,6 +289,14 @@ public:
                             const wxPGProperty,
                             const wxPropertyGridPageState)
 
+    /**
+        Additional copy constructor.
+    */
+    wxPropertyGridConstIterator( const wxPropertyGridIterator& other )
+    {
+        Assign(other);
+    }
+
 protected:
 };