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isWorldMorph
Last updated at 3:19 am UTC on 18 July 2018
There is a method #isWorldMorph implemented for Morph objects as

 isWorldMorph

	^ false

and for PasteUpMorph objects as

 isWorldMorph

	^ worldState notNil

This means if a PasteUpMorph object has a WorldState object attached it is the topmost morph which is the desktop in most cases.