merged 2.2 branch

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/helpwxht.h

@@ -58,7 +58,7 @@ DECLARE_CLASS(wxHelpControllerHtml)
    
 private:
    /// Call the browser using a relative URL.
-   virtual bool DisplayHelp(wxString const &);
+   virtual bool DisplayHelp(const wxString &);
 protected:
    friend class wxHelpFrame;
    class wxHelpFrame *m_Frame;