[core] fix: partially revert #5493, create Portal2 #5512
Merged
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Changes proposed in this pull request:
#5493 caused some unintentional subtle breaks in interactions between the newly refactored Portal function component and the (long-deprecated) react-hot-loader library. To be extra safe, we're going to punt this component refactor to Blueprint v5.0.
This PR reverts Portal to be a class component. I haven't fully reverted #5493 because I wanted to keep the changes which removed React 15 support (which we stopped supporting a long time ago).
The new Portal function component implementation from #5493 is being kept in the repo as Portal2. For now, it is unused. #5511 tracks promoting Portal2 -> Portal in Blueprint v5.0 (along with the new tests and PortalProvider functionality).