[BUG] Setting state in `onError` leads to React warning about setState called during render

[lilactown]

• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• I have read the documentation and cannot find an answer.

Describe the bug
When passing a state setter to the onError prop of MDXEditor, React prints a warning similar to

hook.js:608 Cannot update a component (`DocumentPage`) while rendering a different component (`RealmWithPlugins`). To locate the bad setState() call inside `RealmWithPlugins`, follow the stack trace as described in https://react.dev/link/setstate-in-render

Reproduction
https://stackblitz.com/edit/github-qekvbmto?file=package.json

To Reproduce
Steps to reproduce the behavior:

1. Navigate to the link above
2. Open dev console

Expected behavior
No errors or warnings are presented to the developer in the console

Desktop (please complete the following information):

• OS: macOS
• Browser: Chrome

Additional context
My hunch is this is due to the way gurx propagates values on change- perhaps instead of calling onError directly in the signal setup in the core plugin, using an effect would stop this from happening.

[petyosi]

You can use a any kind of a delay mechanism in the setter to avoid that - that's what the internal implementation would do anyway.

[lilactown]

I ended up doing this to quiet the error:

onError(({ error }) => setTimeout(() => setError(error), 0))

However, this could be broken in concurrent mode, since this is still a side effect during render.

Best practice would be to schedule it to run after the MDXEditor update that triggers the error is committed, i.e. via a useEffect

[petyosi]

@lilactown I'm not certain on the canonical React way here, but would not throwing an Error + an ErrorBoundary around the component work too?

[lilactown]

Yes, that would also work! And do away with the onError callback, I presume