def _pop_chars(self, n=1):
        """
        Remove number of given characters form the right END of the buffer
        :param n:
        :return:
        """
        for _ in xrange(n):
            self._buffer.pop()
        if self.text_length < self.intact_right_bound:
            self.intact_right_bound = self.text_length

        Remove number of given characters form the right END of the buffer
        :param n:
        :return:
        
system/shscreens.py