src/vs/workbench/api/browser/mainThreadNotebook.ts/MainThreadNotebooks/$emitCellStatusBarEvent
class MainThreadNotebooks:	$emitCellStatusBarEvent(eventHandle: number): void {
		const emitter = this._notebookCellStatusBarRegistrations.get(eventHandle);
		if (emitter instanceof Emitter) {
			emitter.fire(undefined);
		}
	}