Openapi.yaml file is not consistent to api.json

Describe the bug We are using desing first for our REST-Api The openapi.yaml file in swagger-ui, which is rendered with smallrye/openapi i think is not consistent with the api.json used to generate our REST- endpoints. Vendor-Extensions of Path-Parameters are rendered on the operation not the Parameter.

Expected behavior Vendor-Extensions of Path-Parameters are rendered on the parameter.

Actual behavior Vendor-Extensions of Path-Parameters are rendered on the operation.

To Reproduce It is easy to reproduce this directly in the smallrye codebase (https://github.com/smallrye/smallrye-open-api/issues/376)

Configuration

# Add your application.properties here, if applicable.

Screenshots (If applicable, add screenshots to help explain your problem.)

Environment (please complete the following information):

• Output of uname -a or ver: MINGW64_NT-10.0-18363 XXX 3.0.7-338.x86_64 2019-11-21 23:07 UTC x86_64 Msys
• Output of java -version: openjdk 11.0.5 2019-10-15 LTS
• GraalVM version (if different from Java):
• Quarkus version or git rev: 1.5.2Final
• Build tool (ie. output of mvnw --version or gradlew --version):

Additional context I think this is not directly a quarkus bug but it makes quarkus harder to use for us and our project. Perhaps this report can be used as tracking bug for upstream

[phillip-kruger]

Definitely before the next Quarkus release, so that we can get that in. We can also do this earlier if needed.

[gsmet]

/cc @MikeEdgar @phillip-kruger