Nullable subschemas

[mrginglymus]

Fixes #12838 in the same way #13303 by not generating a new inline model if the only difference is in readOnly or, now, nullable.

[mrginglymus]

Ah, this appears to have a wider effect than anticipated.

[wing328]

Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/OpenAPITools/openapi-generator/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account

[mrginglymus]

Hi @wing328 I think that's fixed now?

[mrginglymus]

Hi @wing328 anything more needed from me on this?

[c0dezli]

@wing328 Can we get this MR merged?

[c0dezli]

Checking on this again, could we please merge this in?

[c0dezli]

@wing328
I'm sure I'm not the only one blocked by the bug this PR fixes for almost over a year and cannot upgrade to OpenAPI 6+, could we please merge this in?
Thank you very much!

[wing328]

cc @OpenAPITools/generator-core-team

[wing328]

Sorry for the delay in reviewing this fix. We can accept this for the time being and moving forward we'll likely the move the fix to OpenAPI Normalizer, which will be introduced by #14172.

[mrginglymus]

thanks @wing328 - the normalizer looks like a much more sensible approach going forward