Don't unmount iframe after custom component timeout #3315
Merged
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We currently remove a Custom Component's iframe from the render output when it times out, which means the component has no way of belatedly saying "hey I've finally mounted".
This was discovered and fixed by https://github.com/lekev in #3306. I've just added some additional cleanup.