class Prawn::Table::Cell

def width_ignoring_span


colspans.
Returns the width of the cell in its first column alone, ignoring any 
def width_ignoring_span
  # We can't ||= here because the FP error accumulates on the round-trip
  # from #content_width.
  defined?(@width) && @width || (content_width + padding_left + padding_right)
end