XML 'wrapped' lost on internal conversion from openapi v2 to v3

Description

I am currently unable to generate wrapped XML lists using openapi v2. This works fine when I try the same thing with a spec written in openapi v3.

As far as I can tell, this is because openapi-generator drops xml: wrapped: true during the conversion from openapi v2 to v3.

openapi-generator version

Current master

OpenAPI declaration file content or url

Openapi v2 definition that works:

  XmlList:
    description: An XML list with items directly defined
    type: array
    xml:
      wrapped: true
    items:
      type: string
      xml:
        name: xml_list_inner

Is converted to:

      "XmlList" : {
        "type" : "array",
        "description" : "An XML list with items directly defined",
        "items" : {
          "type" : "string",
          "xml" : {
            "name" : "xml_list_inner"
          }
        }

Openapi v2 definition that doesn't:

  XmlListRef:
    description: An XML list with items referenced. The wrapping doesn't currently work - it's stripped during the conversion to openapi v3.
    type: array
    xml:
      wrapped: true
    items:
      $ref: '#/definitions/XmlInner'
  XmlListRefInner:
    type: string
    xml:
      name: xml_list_ref_inner

is converted to:

      "XmlListRef" : {
        "type" : "array",
        "description" : "An XML list with items referenced. The wrapping doesn't currently work - it's stripped during the conversion to openapi v3.",
        "items" : {
          "$ref" : "#/components/schemas/XmlInner"
        }
...
      "XmlListRefInner" : {
        "type" : "string",
        "xml" : {
          "name" : "xml_list_ref_inner"
        }
      },

Openapi v3 definition that works:

components:
  schemas:
    XmlArray:
      type: array
      xml:
        wrapped: true
      items:
        $ref: '#/components/schemas/XmlInner'
    XmlInner:
      type: string
      xml:
        name: another

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Reproduce the conversion using the supplied OpenAPI v2 definitions and compare the resulting v3 schemas, focusing on arrays whose items use $ref. Trace the v2-to-v3 conversion entry point for XML metadata and add a regression test; done means wrapped: true is retained for referenced-item arrays.