Class generation from spec only when spec changed

[c-schmitz-tsystems]

When I start my quarkus application with mvn quarkus:dev the openapi-generator from quarkus always generates the proxies from the swagger file, no matter if the spec changed or not. This triggers the compile and increases the startup time of the dev session.
It would be nice when the generator has a change detection which only generates the proxies in case of a changed swagger file.
Thanks for any comments on this

[ricardozanini]

Yes, that's a known issue since the inception of this extension. Feel free to send a PR to fix it; it's not on my list of priorities now. But I can help review a PR.