parameters: (self, s)
docstring: Sets the id of the page selected before the change.
  
          :param integer `s`: the old selection.
docstring_summary: Sets the id of the page selected before the change.
docstring_tokens: Sets the id of the page selected before the change .
function: def SetOldSelection(self, s):
          """
          Sets the id of the page selected before the change.
  
          :param integer `s`: the old selection.
          """
  
          self.old_selection = s
function_tokens: def SetOldSelection ( self , s ) : self . old_selection = s