On a precomp layer the key covered only the nested comp's size, rate and
duration, so an edit inside the precomp kept a stale analysis. The key now
writes the precomp layer's Essential Properties and what its comp draws, field
by field and recursively. Each comp is written once per key and nesting is
capped, so shared, deep or cyclic precomps are keyed in bounded time. Docs say
what clears an analysis.
arnav-hiwarkar
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