Duplicate dependencies are being rendered

[jonaslagoni]

Describe the bug

Related to next branch.

If a model has duplicate dependencies i.e. two properties that both reference another model. Two dependencies will be rendered which is unintended.

Think something like this should work:

    //Filter out any duplicate dependencies
    dependencyModels = dependencyModels.filter((referenceModel) => {
      return dependencyModels.indexOf(referenceModel) === dependencyModels.lastIndexOf(referenceModel);
    });

    test('should not return duplicate dependencies', () => {
      const stringModel = new StringModel('', undefined);
      const referenceModel = new ReferenceModel('', undefined, stringModel);
      const referenceObjectPropertyModel = new ObjectPropertyModel('reference', false, referenceModel);
      const stringObjectPropertyModel = new ObjectPropertyModel('string', false, stringModel);
      const rawModel = new ObjectModel('test', undefined, {
        reference: referenceObjectPropertyModel,
        reference2: referenceObjectPropertyModel,
        string: stringObjectPropertyModel
      });
      
      const model = constrainMetaModel(mockedTypeMapping, mockedConstraints, {
        metaModel: rawModel,
        constrainedName: '',
        options: undefined
      }) as ConstrainedObjectModel;
      const dependencies = model.getNearestDependencies();
      expect(dependencies).toHaveLength(1);
      expect(dependencies[0]).toEqual(model.properties['reference'].property);
    });