Portal contents re-mount when unmount triggers an update

[smably]

If the portal contents trigger an update on componentWillUnmount, the contents of the portal will re-mount after unmount. See test case: https://gist.github.com/smably/7550b9451682ff533b749f24aa57ca23

In the console:

I would expect that after the portal closes, it remains closed until re-opened by normal means.

[dwick]

i think this is the same issue fixed in #124

[tajo]

Hey, please check the new major version of react-portal: #157

It's React v16 only since its uses the new official Portal API. There is the first beta released and I would like to get your feedback. I don't have bandwidth to maintain v3 which is very different and full of hacks.

I am happy to discuss this with v4 in mind.