Messages outside service proto are wrongly referenced about kalix-jvm-sdk

[octonato]

It also breaks if we define the RefId inside one of the main proto files.

For instance, if I move it inside counter_action.proto the action generation is correct. However, I want to use that same type in the counter_api.proto. If I import it there, the registerValueEntity will get a Com.example.RefId.placeholder.getDescriptor().

To give more context on why I'm trying to share a message.
This is because I want the action to forward to the entity and the return types need to align. This SDK limitation is forcing the sharing of messages types. In any case, even if we remove this limitation from the SDK (which will require a major change) we should be allowed to share types between the proto definitions.

Btw, it's puzzling why it works for EmptyProto and not for RefIdProto. Why are we treating this two differently? Can it be that we generate a placeholder for all files we find and after processing them we forget about this placeholder because it's a standalone definition?

[patriknw]

I tried this and can't reproduce with the new codegen.