src/vs/workbench/contrib/mergeEditor/browser/model/mergeEditorModel.ts/MergeEditorModel/translateInputRangeToBase
class MergeEditorModel:	public translateInputRangeToBase(input: 1 | 2, range: Range): Range {
		const baseInputDiffs = input === 1 ? this.baseInput1Diffs.get() : this.baseInput2Diffs.get();
		const map = new DocumentRangeMap(baseInputDiffs.flatMap(d => d.rangeMappings), 0).reverse();
		return map.projectRange(range).outputRange;
	}