Updated version of the reverted https://github.com/vercel/next.js/pull/43511
Unhandled errors that did not occur during React rendering (those errors are caught in `getDerivedStateFromError` in the Error Overlay) should be opened in the minimized toast state instead of fullscreen. For example if they occur in event handlers or setTimeout. Errors that breaks the app, such as uncaught render errors or build errors, still opens up in fullscreen mode.
The added test make sure the errors opens up as minimized, but if there's a breaking error it should "win" and open up in fullscreen. The updated tests either throw errors inside an event handler or a setTimeout, or the error is handled in a custom error boundary - which means the app don't break.
Closes NEXT-128
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see [`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] [e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs) tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see [`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
## Documentation / Examples
- [ ] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)
