This method is called separately from 'set_oulineexplorer' to avoid
        doing unnecessary updates when there are multiple editor windows

def initialize_outlineexplorer(self):
        """This method is called separately from 'set_oulineexplorer' to avoid
        doing unnecessary updates when there are multiple editor windows"""
        for index in range(self.get_stack_count()):
            if index != self.get_stack_index():
                self._refresh_outlineexplorer(index=index)