Subcomponents don't multiply with parent's alpha

[wchargin]

A GObject is painted strictly with its own alpha. This means that a parent component with alpha < 1 can have children painted at full opacity, e.g.:

GContainer container = ...;
GObject object = ...;
container.add(object);
// Fade out
container.setAlpha(0.5);

Because object's alpha remains the default 1.0, it is painted at full opacity even though its container has decreased in opacity.

This affects controllers and tweens as well.