added GetCurrentSelection(); made GetSelection() behave as documented (and not as before); don't send TEXT_UPDATED events until the combobox is closed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35213 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/combobox.h

@@ -90,6 +90,9 @@ public:
 
     virtual int FindString( const wxString &item ) const;
     int GetSelection() const;
+#if wxABI_VERSION >= 20602
+    int GetCurrentSelection() const;
+#endif
     wxString GetString( int n ) const;
     wxString GetStringSelection() const;
     int GetCount() const;