it is not possible to show/hide the window from the UpdateUI event handler; refactored the code by moving control-specific parts into the derived classes (patch 1338350)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37536 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextctrl.h

@@ -607,7 +607,10 @@ public:
     void InitCommandEvent(wxCommandEvent& event) const;
 
     /// do the window-specific processing after processing the update event
+    //  (duplicated code from wxTextCtrlBase)
+#if !wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
     virtual void DoUpdateWindowUI(wxUpdateUIEvent& event);
+#endif
 
     /// Should we inherit colours?
     virtual bool ShouldInheritColours() const { return false; }