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add a clean target

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bzrlib/progress.py
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    def update(self, msg, current_cnt=None, total_cnt=None):
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        """Update and redraw progress bar."""
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        if current_cnt < 0:
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            current_cnt = 0
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        if current_cnt > total_cnt:
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            total_cnt = current_cnt
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        # save these for the tick() function
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        self.last_msg = msg
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        self.last_cnt = current_cnt
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        if self.throttle():
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            return 
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        if total_cnt:
 
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            assert current_cnt <= total_cnt
 
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        if current_cnt:
 
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            assert current_cnt >= 0
 
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        if self.show_eta and self.start_time and total_cnt:
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            eta = get_eta(self.start_time, current_cnt, total_cnt)
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            eta_str = " " + str_tdelta(eta)