[Etoys] Small fix to ViewerLine

[karl]

The pink rectangle that pop up on a viewerline on mouseover was offset 
when the viewerline showed a color or graphic tile. This it a fix for that.
Karl
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'From OLPC2.0 of ''24 October 2006'' [latest update: #1364] on 16 June 2007 at 11:32:58 pm'!

!ViewerLine methodsFor: 'slot' stamp: 'k 6/16/2007 23:29'!
addSetterFeedback
	"Add screen feedback showing what would be torn off to make a setter"

	| aMorph |
	aMorph _ RectangleMorph new bounds: ((submorphs third topLeft - (2 at 1)) corner: (submorphs last bottomRight) + (2 at 0)).
	aMorph height:(submorphs third height + 1).
	aMorph beTransparent; borderWidth: 2; borderColor: (Color r: 1.0 g: 0.548 b: 0.452); lock.
	ActiveWorld addHighlightMorph: aMorph for: nil! !