Creates a graphics context (as a {@link Graphics2D} object) for the splashscreen overlay image, which allows you to draw over the splash screen. Note that you do not draw on the main image but on the image that is displayed over the main image using alpha blending. Also note that drawing on the overlay image does not necessarily update the contents of splash screen window. You should call {@code update()} on theSplashScreen when you want the splash screen to be updated immediately.
@return graphics context for the splash screen overlay surface
@throws IllegalStateException if the splash screen has already been closed
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