Last updated at 7:08 pm UTC on 23 May 2018
Before an object tree of morphs is written to disk this method is called.
"Prepare this morph to be saved to disk. Subclasses should nil out any instance variables that holds state that should not be saved, such as cached Forms. Note that this operation may take more drastic measures than releaseCachedState; for example, it might discard the transcript of an interactive chat session."
self formerOwner: nil.
self formerPosition: nil.
self removeProperty: #undoGrabCommand.
fullBounds := nil
Method from Oct 2006