Specifically, the layers are stored in a java.awt.Image so that the frequent painting done by Swing on lightweight components will not cause the layers to do unnecessary work rerendering themselves each time.
Changing the default clipping area may cause some Layers to not be drawn completely, depending on what the clipping area is set to and when the layer is trying to get itself painted. When manually adjusting clipping area, make sure that when restricted clipping is over that a full repaint occurs if there is a chance that another layer may be trying to paint itself.
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