def set_col_min_width(self, x: int, min_width: int):
        """Sets a minimum width for blocks in the column with coordinate x."""
        if x < 0:
            raise IndexError('x < 0')
        self._min_widths[x] = min_width
Sets a minimum width for blocks in the column with coordinate x.
cirq-core/cirq/circuits/_block_diagram_drawer.py