protected Color adjustColor(Color c) {
    if (isMacOverlayScrollbar()) {
      int alpha = (int)((120 + myMouseOverScrollbarExpandLevel * 20) * (1 - myMacScrollbarFadeLevel));
      //noinspection UseJBColor
      return new Color(c.getRed(), c.getGreen(), c.getBlue(), alpha);
    }
    else {
      if (myThumbFadeColorShift == 0) return c;
      final int sign = isDark() ? -1 : 1;
      return Gray.get(Math.max(0, Math.min(255, c.getRed() - sign * myThumbFadeColorShift)));
    }
  }
protected Color adjustColor(Color c)