from preamble:

"Change Set:		LargeLists
Date:			19 August 2001
Author:			Lex Spoon

Adds an option to PluggableListMorph and friends so that very large
lists can be efficiently displayed.  The trick is to only process list
elements that are currently visible.  To use the functionality, a
pluggable list morph must be supplied with two additional selectors: one
to extract a single element of the list, and another to query the size
of the whole list without calculating the list itself.

Be warned that the model must call update: whenever the list changes,
and in particular whenever the list shrinks.  verifyContents does not
work properly for PLM's that have the two extra selectors specified."!
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