preserve window's content when changing the fonts

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37862 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/html/htmlwin.h

@@ -269,9 +269,13 @@ protected:
     void StopAutoScrolling();
 #endif // wxUSE_CLIPBOARD
 
-protected:
     wxString DoSelectionToText(wxHtmlSelection *sel);
 
+private:
+    // implementation of SetPage()
+    bool DoSetPage(const wxString& source);
+
+protected:
     // This is pointer to the first cell in parsed data.  (Note: the first cell
     // is usually top one = all other cells are sub-cells of this one)
     wxHtmlContainerCell *m_Cell;