Fix Suspense throttling mechanism (#26802)
Summary:
The throttling mechanism for fallbacks should apply to both their
appearance _and_ disappearance.
This was mostly addressed by #26611. See that PR for additional context.
However, a flaw in the implementation is that we only update the the
timestamp used for throttling when the fallback initially appears. We
don't update it when the real content pops in. If lots of content in
separate Suspense trees loads around the same time, you can still get
jank.
The issue is fixed by updating the throttling timestamp whenever the
visibility of a fallback changes. Not just when it appears.
DiffTrain build for commit 4bfcd02b2c
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Reviewed By: hoxyq
Differential Revision: D45920350
Pulled By: sammy-SC
fbshipit-source-id: f5df1709a66e8014d4458fdfdf960d58e0acc45f
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