src/vs/workbench/contrib/notebook/browser/contrib/cellOperations/cellOperations.ts/splitCell
export async function splitCell(context: INotebookCellActionContext): Promise<void> {
	const newCells = await context.notebookEditor.splitNotebookCell(context.cell);
	if (newCells) {
		context.notebookEditor.focusNotebookCell(newCells[newCells.length - 1], 'editor');
	}
}