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/gtk1/notebook.h

@@ -52,9 +52,12 @@ public:
     // set the currently selected page, return the index of the previously
     // selected one (or -1 on error)
     // NB: this function will _not_ generate wxEVT_NOTEBOOK_PAGE_xxx events
-  int SetSelection(size_t nPage);
+    int SetSelection(size_t nPage) { return DoSetSelection(nPage, SetSelection_SendEvent); }
     // get the currently selected page
-  int GetSelection() const;
+    int GetSelection() const;
+
+    // changes selected page without sending events
+    int ChangeSelection(size_t nPage) { return DoSetSelection(nPage); }
 
     // set/get the title of a page
   bool SetPageText(size_t nPage, const wxString& strText);
@@ -126,10 +129,15 @@ public:
     // flag set to true while we're inside "switch_page" callback
     bool m_inSwitchPage;
 
+    // flag set to true when the switch-page signal has been programatically generated
+    bool m_skipNextPageChangeEvent;
+
 protected:
     // remove one page from the notebook but do not destroy it
     virtual wxNotebookPage *DoRemovePage(size_t nPage);
 
+    int DoSetSelection(size_t nPage, int flags = 0);
+
 private:
     // the padding set by SetPadding()
     int m_padding;