code: def format_fullwidth(self, value):
          
          assert isinstance(value, VTMLBuffer)
          pad = self.colspec[0]['padding']
          fmt = self.make_formatter(self.width - pad, pad,
                                    self.table.title_align)
          return VTMLBuffer('\n').join(fmt(value))
docs: Return a full width column. Note that the padding is inherited
          from the first cell which inherits from column_padding.