code: public static IntSupplier leftOf(ISized owner, IPositioned other, int spacing)
  	{
  		checkNotNull(other);
  		return () -> {
  			return other.position().x() - owner.size().width() - spacing;
  		};
  	}
docs: Positions the owner to the left of the other.
  
  @param other the other
  @param spacing the spacing
  @return the int supplier