This class presents a view of a two change sets at once, and supports copying changes between change sets.

	other
	isLeftSide: labelString modelWakeUp other:

	initialization	top
	morphicWindow
	okToChange Allows a controller to ask this of any model
	open
	openAsMorph
	release Remove references to objects that may refer to the receiver. This message should be overridden by subclasses with any cycles, in which case the subclass should also include the expression super release.

	other	top
	isLeftSide: Which side am I?
	labelString The window label
	modelWakeUp A window with me as model is being entered. Make sure I am up-to-date with the changeSets.
	other: Return the other side's ChangeSorter

	opening	top
	open Open a new instance of the receiver's class
	prototypicalToolWindow Answer an example of myself seen in a tool window, for the benefit of parts-launching tools