Under the hood
Useful1 Signal1
Layout measurements can be thrown away in place so a screen can be re-measured once before giving up.
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What
The layout node class gained a recursive cache clear that marks every node in the tree dirty and resets its cached measurement and flexbox generation counters, with an iteration budget derived from the live node count. This is what makes the single re-layout retry different from simply laying out again.
Evidence
clearLayoutCacheRecursive()
Strings lifted out of the shipped bundle, so the claim above can be checked against them.