src/vs/workbench/contrib/notebook/common/notebookEditorModel.ts/ComplexNotebookEditorModel/_resolveStats
class ComplexNotebookEditorModel:	private async _resolveStats(resource: URI) {
		if (resource.scheme === Schemas.untitled) {
			return undefined;
		}

		try {
			this._logService.debug(`[notebook editor model] _resolveStats`, this.resource.toString(true));
			const newStats = await this._fileService.stat(this.resource);
			this._logService.debug(`[notebook editor model] _resolveStats - latest file stats: ${JSON.stringify(newStats)}`, this.resource.toString(true));
			return newStats;
		} catch (e) {
			return undefined;
		}
	}