`allOf` pulls in incorrect `$ref` value

[owenconti]

Say we have two definitions: Pet and Cat. Cat extends Pet using the allOf function.

After swagger-js parses the spec, the resulting definition for Cat contains a $ref property with the value of PATH/Pet, instead of the expected value of PATH/Cat.

This results in swagger-ui displaying the wrong name and tooltips for models that were built using allOf, as seen in the screenshots below:

This screenshot shows the name of the model, and its $ref value. Note that the Cat model has an incorrect $ref value.

This screenshot shows the incorrect value of the tooltip when hovering the Cat model name.

This screenshot shows the incorrect name of the model and incorrect value of the tooltip for the Cat model, which is inside a oneOf option of the Animal model.

The issue is happening with OAS 2.0 and OAS 3.0 specs.

openapi: 3.0.0
info:
  version: 0.0.0
  title: test
paths: {}
components:
  schemas:
    Pet:
      type: object
      properties:
        name:
          type: string
      required:
        - name
    Cat:
      allOf:
        - $ref: '#/components/schemas/Pet'
        - type: object
          properties:
            meowVolume:
              type: string
              enum:
              - loud
              - quiet
    Animal:
      type: object
      properties:
        pet:
          $ref: '#/components/schemas/Pet'
        cat:
          $ref: '#/components/schemas/Cat'

swagger: "2.0"
info:
  version: 0.0.0
  title: test
paths: {}
definitions:
  Pet:
    type: object
    properties:
      name:
        type: string
    required:
      - name
  Cat:
    allOf:
      - $ref: '#/definitions/Pet'
      - type: object
        properties:
          meowVolume:
            type: string
            enum:
            - loud
            - quiet
  Animal:
    type: object
    properties:
      pet:
        $ref: '#/definitions/Pet'
      cat:
        $ref: '#/definitions/Cat'