def width
      @width ||= list.map { |t| t.name_with_args ? t.name_with_args.length : 0 }.max || 10
    end
def width
      @width ||= list.map { |t| t.name_with_args ? t.name_with_args.length : 0 }.max || 10
    end
Determine the max count of characters for all task names.
 @return [integer] count of characters