[JavaJaxRS (repros in Java too)] Inherited properties missing from generated model.

Description

When a swagger definition uses allOf to both include normal properties and inherit the properties of another model using $ref the generated model is missing the properties of the inherited model.

My use case is for the JavaJaxRS language target, but the below repro case is for the Java language target.

Swagger-codegen version

2.2.2-SNAPSHOT

Tried changing swagger-parser-version to be 1.0.23 in the pom, but the problem still persists.

Swagger declaration file content or url

Command line used for generation

Steps to reproduce

See Repro case gist

Related issues

Might be related to https://github.com/swagger-api/swagger-codegen/issues/3544

Suggest a Fix

Although I've done some digging in the source, I'm not yet familiar enough with the codebase to know what portions of it are responsible for propagating the inherited properties through to the composed model.

The expected behavior is that the composed model includes inherited properties.

Start with the linked repro case and the Java language target, then trace how an allOf composition with a $ref is represented during model generation. Done means the generated composed model includes the inherited properties as well as its normal properties.