[BUG] Duplicate models are produced when a file is referenced multiple times by different paths

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

A recent openapi-generator release upgraded swagger-parser to 2.1.22. That upgrade resolved a bug where the parser was unable to resolve relative refs to real file paths, but it introduced a new bug where the parser creates duplicate schema objects for each unique relative path, rather than reusing an existing schema when two (or more) relative paths are equivalent.

openapi-generator version

v7.5.0

OpenAPI declaration file content or url

Refer to https://github.com/swagger-api/swagger-parser/pull/2105 for a reproduction OpenAPI spec.

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

I don't think there's a way to work around this issue in openapi-generator itself; instead it requires a fix in swagger-parser that is then pulled in to this project in a future parser upgrade.

The issue points to swagger-parser PR #2105 for the reproduction and says the fix belongs in swagger-parser before a future openapi-generator parser upgrade. Read that reproduction first, verify the duplicate schema objects with v7.5.0, and consider the work done when equivalent relative paths reuse one model.