auto deserialize JSON/XML in advanced playground

[NeilFraser]

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Description

For all plugins, the demo page has JSON/XML/JavaScript/Python/etc tabs. All these tabs are read-only, with the exception of JSON/XML. But pasting or editing the JSON/XML does nothing. Either they should all be read-only, or editing the serialization formats should actually do something.

Reproduction steps

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[BeksOmega]

If you right click, you can import the serialized state. I think this might be more of a feature request to have it automatically deserialize.

[NeilFraser]

Oof, that right-click is not very discoverable.

[maribethb]

Adding a button or something more visible would be fine, or doing it automatically (only on enter, not every keypress)