xkcd-Android
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Rotation will cause stale fragments in ChildFragmentManager
Open app, rotate several times.
Fragments added
in ChildFragmentManager will be 3 * rotation
.
Could be leak, also too large savedInstance issue.
https://stackoverflow.com/a/40245070/5292852
Maybe check an example, see how fm behave.
Checked ViewPager2 1.0.0, the scroll is not natural, and buggy on What if nested scroll.