src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts/NotebookCellList/elementHeight
class NotebookCellList:	elementHeight(element: ICellViewModel): number {
		const index = this._getViewIndexUpperBound(element);
		if (index === undefined || index < 0 || index >= this.length) {
			this._getViewIndexUpperBound(element);
			throw new ListError(this.listUser, `Invalid index ${index}`);
		}

		return this.view.elementHeight(index);
	}