dillon1000/react

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Fix mount and unmount warnings in Fiber (#10056)

* Warn if unmounting a non-container

* Warn if the 2nd+ child is a "root" element but not first

This triggers our non-reuse mode. This is covered by ReactMount already but
the test doesn't pass yet without also landing #10026.
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Sebastian Markbåge authored 52a2365f19a71666e3131e03ace56ef64d9a6341 Parent f8a3a39
Changed paths3 files
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M scripts/fiber/tests-passing-except-dev.txt ModifiedM scripts/fiber/tests-passing.txt ModifiedM src/renderers/dom/fiber/ReactDOMFiberEntry.js Modified
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