def findFirstMovieCol(self, movie):    
        """ Cycle through the whole movie, figure out the leftmost column that
            == blank on all frames, return that #. Used to trim blank lines
            when saving. """
        movieFirstCol = movie.sizeX
        for frame in movie.frames:
            frameFirstCol = self.findFrameFirstCol(frame)
            if frameFirstCol < movieFirstCol:
                movieFirstCol = frameFirstCol
        return movieFirstCol
 Cycle through the whole movie, figure out the leftmost column that
            == blank on all frames, return that #. Used to trim blank lines
            when saving. 
durdraw/durdraw_ui_curses.py