def calculate_dimension(self):
        if self._cells:
            rows = set()
            cols = set()
            for row, col in self._cells:
                rows.add(row)
                cols.add(col)
            max_row = max(rows)
            max_col = max(cols)
            min_col = min(cols)
            min_row = min(rows)
        else:
            return "A1:A1"

        return '%s%d:%s%d' % (
            get_column_letter(min_col), min_row,
            get_column_letter(max_col), max_row
        )
Is there a change to the mtime map? return a boolean
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/openpyxl-2.3.0-b2/openpyxl/worksheet/worksheet.py/Worksheet.calculate_dimension--crossover with--dataset/ETHPy150Open saltstack/salt/salt/fileserver/__init__.py/diff_mtime_map