[Pharo-project] [Issue] 2533 GradientFillStyle cant change first and last color from halo menu

Open RectangleMorph. Set him gradient fill style. Try change first or second color. Nothing happen. Reason is caching pixelRamp of Gradient. Solution is deep copy of color ramp in target methods. See http://code.google.com/p/pharo/issues/detail?id=2533