src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts/NotebookCellList/getModelIndex2
class NotebookCellList:	getModelIndex2(viewIndex: number): number | undefined {
		if (!this.hiddenRangesPrefixSum) {
			return viewIndex;
		}

		const modelIndex = this.hiddenRangesPrefixSum.getPrefixSum(viewIndex - 1);
		return modelIndex;
	}