src/vs/workbench/contrib/notebook/browser/diff/diffNestedCellViewModel.ts/DiffNestedCellViewModel/getOutputOffset
class DiffNestedCellViewModel:	getOutputOffset(index: number): number {
		this._ensureOutputsTop();

		if (index >= this._outputCollection.length) {
			throw new Error('Output index out of range!');
		}

		return this._outputsTop!.getPrefixSum(index - 1);
	}