Fixed bug in DnD. wxDragSource will now delete itself when done.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4640 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/wxPython/src/clip_dnd.i

@@ -411,6 +411,8 @@ public:
                    const wxIcon &go = wxNullIcon)
         : wxDropSource(win, go) {}
 #endif
+    ~wxPyDropSource() { printf("dtor\n"); }
+
     DEC_PYCALLBACK_BOOL_DR(GiveFeedback);
     PYPRIVATE;
 };
@@ -432,8 +434,8 @@ public:
                    const wxIcon &go = wxNullIcon);
 #endif
 
-    void _setSelf(PyObject* self);
-    %pragma(python) addtomethod = "__init__:self._setSelf(self)"
+    void _setSelf(PyObject* self, int incref);
+    %pragma(python) addtomethod = "__init__:self._setSelf(self, 0)"
     ~wxPyDropSource();
 
     void SetData(wxDataObject& data);