My instances specify the starting and stopping points in a String of a composed line. The step is always 1.

	comparing
	=

	private
	internalSpaces:paddingWidth: lineHeight:baseline:

	scanning
	justifiedPadFor: justifiedTabDeltaFor:

	updating
	slide:

	accessing	top
	baseline
	internalSpaces Answer the number of spaces in the line.
	internalSpaces: Set the number of spaces in the line to be spacesInteger.
	lineHeight
	paddingWidth Answer the amount of space to be added to the font.
	paddingWidth: Set the amount of space to be added to the font to be padWidthInteger.
	stop: Set the stopping point in the string of the line to be stopInteger.

	comparing	top
	= Answer true if my species and anInterval species are equal, and if our starts, steps and sizes are equal.

	private	top
	internalSpaces:paddingWidth:
	lineHeight:baseline:

	scanning	top
	justifiedPadFor: Compute the width of pad for a given space in a line of justified text.
	justifiedTabDeltaFor: Compute the delta for a tab in a line of justified text, so tab falls somewhere plausible when line is justified.

	updating	top
	slide: Change the starting and stopping points of the line by delta.

	instance creation	top
	start:stop:internalSpaces:paddingWidth: Answer an instance of me with the arguments as the start, stop points, number of spaces in the line, and width of the padding.