src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/getViewIndexByModelIndex
class NotebookEditorWidget:	getViewIndexByModelIndex(index: number): number {
		if (!this._listViewInfoAccessor) {
			return -1;
		}
		const cell = this.viewModel?.viewCells[index];
		if (!cell) {
			return -1;
		}

		return this._listViewInfoAccessor.getViewIndex(cell);
	}