1. restored wxEvent::operator=()

2. removed wxListEvent::CopyObject()
3. refresh fixes to MSW virtual list control


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12554 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -372,9 +372,6 @@ public:
     bool              m_isCommandEvent;
 
 private:
-    // normally copying the events is a bad idea, so disable this
-    wxEvent& operator=(const wxEvent&);
-
     DECLARE_ABSTRACT_CLASS(wxEvent)
 };