http://users2.ipa.net/~jmcvay/squeak/2.6/SubmorphHalo.cs

from the preamble:

this changeset provides a magenta halo that allows you to quickly
select the currently selected morph's owners or submorphs. i will beef
this up and make it more useful at a later time.

selecting the halo with shift automatically selects the morph's main
owner--the morph highest in the selected morph's owner chain just below
the WorldMorph



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