src/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsTree/length.ts/LengthObj/lengthDiffNonNegative
class LengthObj:	public static lengthDiffNonNegative(start: LengthObj, end: LengthObj): LengthObj {
		if (end.isLessThan(start)) {
			return LengthObj.zero;
		}
		if (start.lineCount === end.lineCount) {
			return new LengthObj(0, end.columnCount - start.columnCount);
		} else {
			return new LengthObj(end.lineCount - start.lineCount, end.columnCount);
		}
	}