public static @NotNull Color background(boolean focused) {
          //todo[kb] remove?
          //if (focused && UIUtil.isUnderDefaultMacTheme()) {
          //  double alpha = getInt("List.selectedItemAlpha", 75);
          //  if (0 <= alpha && alpha < 100) return ColorUtil.mix(Color.WHITE, BACKGROUND, alpha / 100.0);
          //}
          return focused ? BACKGROUND : Inactive.BACKGROUND;
        }
public static @NotNull Color background(boolean focused)