@ApiStatus.Internal
  protected final float getProportionForSecondSize(int secondSize, int totalSize) {
    checkSize(secondSize);
    checkTotalSize(totalSize);
    return (float)(totalSize - getDividerWidth() - secondSize) / (totalSize - getDividerWidth());
  }
@ApiStatus.Internal
  protected final float getProportionForSecondSize(int secondSize, int totalSize)