[Pharo-project] Why using Sensor instead of World activeHand in Morph code?

Morph>>doFastReframe: ptName | newBounds | "For fast display, only higlight the rectangle during loop" newBounds := self boundsInWorld newRectButtonPressedDo: [:f | f withSideOrCorner: ptName setToPoint: Sensor cursorPoint minExtent: self minimumExtent]. Display deferUpdatesIn: Display boundingBox while: [ self bounds: newBounds]. ^newBounds. Stef