src/vs/workbench/contrib/notebook/browser/viewModel/notebookViewModelImpl.ts/NotebookViewModel/getCellsInRange
class NotebookViewModel:	getCellsInRange(range?: ICellRange): ReadonlyArray<ICellViewModel> {
		if (!range) {
			return this._viewCells.slice(0);
		}

		const validatedRange = this.validateRange(range);

		if (validatedRange) {
			const result: ICellViewModel[] = [];

			for (let i = validatedRange.start; i < validatedRange.end; i++) {
				result.push(this._viewCells[i]);
			}

			return result;
		}

		return [];
	}