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Trigger the scrollbars to draw. When invoked this method starts an animation to fade the scrollbars out after a default delay. If a subclass provides animated scrolling, the start delay should equal the duration of the scrolling animation.
The animation starts only if at least one of the scrollbars is enabled, as specified by View.HorizontalScrollBarEnabled and View.VerticalScrollBarEnabled. When the animation is started, this method returns true, and false otherwise. If the animation is started, this method calls View.Invalidate; in that case the caller should not call View.Invalidate.
This method should be invoked every time a subclass directly updates the scroll parameters.
This method is automatically invoked by View.ScrollBy(int, System.Int32) and View.ScrollTo(int, System.Int32).