src/vs/workbench/contrib/notebook/browser/controller/executeActions.ts/renderAllMarkdownCells
function renderAllMarkdownCells(context: INotebookActionContext): void {
	for (let i = 0; i < context.notebookEditor.getLength(); i++) {
		const cell = context.notebookEditor.cellAt(i);

		if (cell.cellKind === CellKind.Markup) {
			cell.updateEditState(CellEditState.Preview, 'renderAllMarkdownCells');
		}
	}
}