'Handle editor \'show surrounding parens\' event (menu or shortcut).'

def flash_paren_event(self, event):

    indices = HyperParser(self.editwin, 'insert').get_surrounding_brackets()
    if (indices is None):
        self.bell()
        return 'break'
    self.activate_restore()
    self.create_tag(indices)
    self.set_timeout()
    return 'break'
