src/vs/workbench/contrib/mergeEditor/browser/model/mapping.ts/RangeMapping/addInputLineDelta
class RangeMapping:	addInputLineDelta(deltaLines: number): RangeMapping {
		return new RangeMapping(
			new Range(
				this.inputRange.startLineNumber + deltaLines,
				this.inputRange.startColumn,
				this.inputRange.endLineNumber + deltaLines,
				this.inputRange.endColumn
			),
			this.outputRange,
		);
	}