src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/focusNextNotebookCell
class NotebookEditorWidget:	focusNextNotebookCell(cell: ICellViewModel, focusItem: 'editor' | 'container' | 'output') {
		const idx = this.viewModel?.getCellIndex(cell);
		if (typeof idx !== 'number') {
			return;
		}

		const newCell = this.viewModel?.cellAt(idx + 1);
		if (!newCell) {
			return;
		}

		this.focusNotebookCell(newCell, focusItem);
	}