src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/focusElement
class NotebookEditorWidget:	focusElement(cell: ICellViewModel) {
		this.viewModel?.updateSelectionsState({
			kind: SelectionStateType.Handle,
			primary: cell.handle,
			selections: [cell.handle]
		});
	}