Merge "Prevent windows from dimming if host is going away" into main

     */

    protected void adjustAppearance(@NonNull WindowState dimmingContainer,

                                    float alpha, int blurRadius) {

        if (!mHost.isVisibleRequested()) {

            // If the host is already going away, there is no point in keeping dimming

            return;

        }

        if (mDimState != null || (alpha != 0 || blurRadius != 0)) {

            final DimState d = obtainDimState(dimmingContainer);

            d.prepareLookChange(alpha, blurRadius);