Incorrectly handling of "discriminatedOneOf" case when referencing classes with "allOf"

[triorph]

If the discriminator is in the same location as oneOf, and the oneOf references a component that has an allOf, then the system complains that the component is does not contain the required property, as it doesn't directly have it, but gains it indirectly via inheritance.

I took a quick look at writing a test case for this:

openapi: 3.0.0
info:
paths:
components:
  schemas:
    SomeObj:
      type: object
      required:
        - state
      properties:
        state:
          $ref: '#/components/schemas/State'
    State:
      oneOf:
        - $ref: '#/components/schemas/StateA'
        - $ref: '#/components/schemas/StateB'
      discriminator:
        propertyName: status
        mapping:
          a: '#/components/schemas/StateA'
          b: '#/components/schemas/StateB'
    Status:
      type: string
      enum:
        - a
        - b
    ParentState:
      type: object
      required:
        - status:
      properties:
        status:
          $ref: '#/components/schemas/Status'
    StateA:
      allOf:
        - $ref: '#/components/schemas/ParentState'
        - type: object
          properties:
            otherA: 
              type: string
    StateB:
      allOf:
        - $ref: '#/components/schemas/ParentState'
        - type: object
          properties:
            otherB: 
              type: string

based on the discriminatedOneOf test, but wasn't able to get a working solution in the actual code.

Also a question: is the discriminatedOneOf models.kt output correct? It seems like the public object StateA: State is just an interface and doesn't contain the Status enum anywhere.