from preamble:

"Change Set:		ColorSeesTurtleTrailsToo-nk
Date:			4 July 2003
Author:			Ned Konz

This adds a per-Project Preference called #colorSeesTurtleTrailsToo.

When this preference is set, the #color:sees: and #touchesColor: (but
not the #colorUnder) methods will take into account the turtle trails as
well.

This makes it possible to write eToys scripts that can see the turtle
trails.

By default, this preference is false, for backwards compatibility.

This also avoids an unnecessary ColorPatchCanvas copy that was in
#patchAt:without:andNothingAbove:

"

Preferences preferenceAt: #colorSeesTurtleTrailsToo
ifAbsent: [ Preferences
	addPreference: #colorSeesTurtleTrailsToo
	categories: #(scripting)
	default: false
	balloonHelp: 'if true, the ''color:sees:'' and ''touchesColor:'' tests
in eToys (but not ''colorUnder'') will also see turtle trails'
	projectLocal: true
	changeInformee: nil
	changeSelector: nil
].!
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