class Prawn::Table::Cell

def width


group.
the master cell of a colspan, returns the width of the entire span
Returns the cell's width in points, inclusive of padding. If the cell is 
def width
  return width_ignoring_span if @colspan == 1 && @rowspan == 1
  # We're in a span group; get the maximum width per column (including
  # the master cell) and sum each column.
  column_widths = Hash.new(0)
  dummy_cells.each do |cell|
    column_widths[cell.column] =
      [column_widths[cell.column], cell.width].max
  end
  column_widths[column] = [column_widths[column], width_ignoring_span].max
  column_widths.values.inject(0, &:+)
end