src/vs/workbench/contrib/notebook/common/notebookEditorModel.ts/ComplexNotebookEditorModel/isReadonly
class ComplexNotebookEditorModel:	isReadonly(): boolean {
		if (this._fileService.hasCapability(this.resource, FileSystemProviderCapabilities.Readonly)) {
			return true;
		} else {
			return false;
		}
	}