message: fix: node.isRoot for non-mirage nodes
diff: @@ -224,7 +224,8 @@ export default class NodeModel extends BaseFileItem.extend(Validations, Collecta
  @computed('root')
  get isRoot() {
  - return !this.belongsTo('root').id();
  + const rootId = this.belongsTo('root').id();
  + return !rootId || rootId === this.id;
  }
  // BaseFileItem override
  