ExternalRefProcessor incorrectly handles composed schemas in array items

[chimmi]

If we have following spec:

openapi: 3.0.1
info:
  title: API
  description: API
  version: LATEST
paths:
  /test-path:
    post:
      requestBody:
        required: true
        content:
          text/plain:
            schema:
              type: string
      responses:
        200:
          description: OK
          content:
            application/json:
              schema:
                $ref: 'definitions.yaml#/components/schemas/Response'

And corresponding definitions.yaml:

components:
  schemas:
    Response:
      type: array
      items:
        oneOf:
          - $ref: '#/components/schemas/ProductRow'
        discriminator:
          propertyName: type
          mapping:
            'product': '#/components/schemas/ProductRow'
    ProductRow:
      type: object
      additionalProperties: false
      required:
        - type
      properties:
        type:
          $ref: '#/components/schemas/ProductsRowType'
        payload:
          type: string
    ProductsRowType:
      type: string
      enum:
        - product

ExternalRefProcessor will fail to resolve all necessary references, which results in only Response model being loaded.

[chimmi]

[PR] (#2072)

[frantuma]

fixed in #2072, thanks!