code: public Range getAbsoluteRangeFor(Range relativeRange) {
          int from = convertBoundaryToAbsolutePosition(relativeRange.getFrom()),
                  to = convertBoundaryToAbsolutePosition(relativeRange.getTo());
          return new Range(from, to);
      }
docs: Reverse operation for {@link #getRelativeRangeOf(Range)}.
  
  A.getAbsoluteRangeFor(A.getRelativeRangeOf(B)) == B
  
  @param relativeRange range defined relative to this range
  @return absolute range