I am a view used to display a Scene. I may be scrolled by adjusting my offset. My default controller is SceneController.

SceneViews encapsulate the notion of a changing foreground and a fixed background during interactive updates. During an interaction (such as dragging), some of the glyphs will not change location or appearance. These are part of the "background". All glyphs that may change (the "foreground" glyphs) are painted against this unchanging backdrop during the interaction.

Instance Variables:
offset the current offset of this view (used for scrolling)
enclosingRect a rectangle large enough to contain all the objects in the scene, plus a small border (this is a cache that must be recomputed when glyphs are moved, added, or removed from the scene)
backgroundForm a <Form> containing the fixed background
visibleForeground the glyphs that are changing but not selected during an interaction
selectedForeground the selected glyphs that are changing during an interaction

	as yet unclassified	top
	computeInsetDisplayBox This overrides the same method in View. (It avoids using displayTransform: because it can return inaccurate results, causing a MorphWorldView's inset display box to creep inward when resized.)
	deEmphasizeView This window is becoming inactive.
	defaultControllerClass Answer the class of the default controller for the receiver. Subclasses should redefine View|defaultControllerClass if the class of the default controller is not Controller.
	displayView This method is called by the system when the top view is framed or moved.
	update: Normally sent by the receiver's model in order to notify the receiver of a change in the model's state. Subclasses implement this message to do particular update actions. A typical action that might be required is to redisplay the receiver.
	updateSubWindowExtent If this MorphWorldView represents a single Morphic SystemWindow, then update that window to match the size of the WorldView.

	instance creation	top
	convertToMVCWiWPasteUpMorph MorphWorldView convertToMVCWiWPasteUpMorph
	fullColorWhenInactive
	fullColorWhenInactive: MorphWorldView fullColorWhenInactive: true
	openOn: Open a view on the given WorldMorph.
	openOn:label: Open a view with the given label on the given WorldMorph.
	openOn:label:cautionOnClose: Open a view with the given label on the given WorldMorph.
	openOn:label:extent: Open a view with the given label and extent on the given WorldMorph.
	openOn:label:model: Open a view with the given label on the given WorldMorph.
	openWorld
	openWorldWith:labelled: