src/vs/workbench/contrib/mergeEditor/browser/model/mapping.ts/DetailedLineRangeMapping/join
class DetailedLineRangeMapping:	public override join(other: DetailedLineRangeMapping): DetailedLineRangeMapping {
		return new DetailedLineRangeMapping(
			this.inputRange.join(other.inputRange),
			this.inputTextModel,
			this.outputRange.join(other.outputRange),
			this.outputTextModel,
		);
	}