[ReactAdapter] Passing a JsonValue to setState should pass it to the client as it is

[stefanuebe]

Description of the bug

In my ReactAdapterComponent, I need a json object on the client and want to pass that from the server using setState. Unfortunately the method does not check, if the given parameter is already a valid json object and serialize it nevertheless. That results in an invalid json object on the client.

Expected behavior

Since setState does nothing else than calling setPropertyJson, it should check for the parameter and skip the serialization, if the given object can be passe directly.

It might also make sense to overhaul the JacksonUtils regarding this behavior.

Minimal reproducible example

Create a ReactAdapterComponent subclass. Use setState and pass some JsonValue.

Versions

• Vaadin / Flow version: 24.8. alpha7
• Java version: 17