Possible unnecessary reset of schema ref

[sskserk]

Hi @fenollp,

It seems that cleaning the ref.Value https://github.com/getkin/kin-openapi/blob/v0.124.0/openapi3gen/openapi3gen.go#L150 is no more actual. A type refers a subtype, thus it is necessary not only to preserve the Ref but also the Value. Otherwise the validation of schema fails.

Don't you think so?

CC @EnriqueL8

func (g *Generator) NewSchemaRefForValue(value interface{}, schemas openapi3.Schemas) (*openapi3.SchemaRef, error) {
	ref, err := g.GenerateSchemaRef(reflect.TypeOf(value))
	if err != nil {
		return nil, err
	}
	for ref := range g.SchemaRefs {
		refName := ref.Ref
		if g.opts.exportComponentSchemas.ExportComponentSchemas && strings.HasPrefix(refName, "#/components/schemas/") {
			refName = strings.TrimPrefix(refName, "#/components/schemas/")
		}

		if _, ok := g.componentSchemaRefs[refName]; ok && schemas != nil {
			if ref.Value != nil && ref.Value.Properties != nil {
				schemas[refName] = &openapi3.SchemaRef{
					Value: ref.Value,
				}
			}
		}
		if strings.HasPrefix(ref.Ref, "#/components/schemas/") {
			ref.Value = nil
		} else {
			ref.Ref = ""
		}
	}
	return ref, nil
}