src/vs/editor/browser/widget/diffEditorWidget.ts/SideBySideViewZonesComputer/_produceModifiedFromDiff
class SideBySideViewZonesComputer:	protected _produceModifiedFromDiff(lineChange: ILineChange, lineChangeOriginalLength: number, lineChangeModifiedLength: number): IMyViewZone | null {
		if (lineChangeOriginalLength > lineChangeModifiedLength) {
			return {
				afterLineNumber: Math.max(lineChange.modifiedStartLineNumber, lineChange.modifiedEndLineNumber),
				heightInLines: (lineChangeOriginalLength - lineChangeModifiedLength),
				domNode: null
			};
		}
		return null;
	}