from preamble:

"Change Set:		ViewBoxFix-nk
Date:			15 April 2002
Author:			Ned Konz <ned at bike-nomad.com>

If you try to make a PasteUpMorph the model in a SystemWindow,
PasteUpMorph>>viewBox: assumes incorrectly that the PUM is a World.

That is, this should work:

| p w |
p _ PasteUpMorph new extent: 100 at 100.
w _ (SystemWindow labelled: 'whoops!!') model: p.
w addMorph: p frame: (0 at 0 extent: 1 at 1).
w openInWorld.

This change set adds some conditionals in PasteUpMorph>>viewBox: to
check if the PUM is indeed a World.
"!
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