added wxBookCtrl::ChangeSelection() which is the same as SetSelection() but doesn't send the page change events (second part of patch 1553551)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41738 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/notebook.h

@@ -92,6 +92,9 @@ public:
     // get the currently selected page
   int GetSelection() const { return m_nSelection; }
 
+    // changes selected page without sending events
+  int ChangeSelection(size_t nPage);
+
     // set/get the title of a page
   bool SetPageText(size_t nPage, const wxString& strText);
   wxString GetPageText(size_t nPage) const;
@@ -193,6 +196,9 @@ protected:
   // common part of all ctors
   void Init();
 
+  // hides m_nSelection-th page, shows the newsel-th one and updates m_nSelection
+  void UpdateSelection(size_t newsel);
+
   // remove one page from the notebook, without deleting
   virtual wxNotebookPage *DoRemovePage(size_t nPage);