src/vs/workbench/contrib/mergeEditor/browser/model/diffComputer.ts/rangeMappingFromLineRanges
function rangeMappingFromLineRanges(originalRange: LineRange, modifiedRange: LineRange): RangeMapping {
	return new RangeMapping(
		new Range(
			originalRange.startLineNumber,
			1,
			originalRange.endLineNumberExclusive,
			1,
		),
		new Range(
			modifiedRange.startLineNumber,
			1,
			modifiedRange.endLineNumberExclusive,
			1,
		)
	);
}