dotCooCoo ee69d5ac39 Preflight: the worker keeps its compositions out of the interface thread's cache ...

The worker checks the document state it was given, which is often one
edit behind the interface. It composed that older state into the shared
composition cache, replacing the interface thread's composition of the
current state, so the next frame composed the edited story again (about
14 ms per edit for a 10-page story).

Cache::over makes a cache that uses another cache's compositions of the
same state and keeps whatever it composes to itself. The worker checks
with one over the interface thread's cache, keeps it for the next check
of the same document, and drops it after a minute without jobs.

With no active document, the job waiting for a busy worker is dropped,
so it no longer keeps a closed document in memory until another
document opens.

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..

examples

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src

Preflight: the worker keeps its compositions out of the interface thread's cache

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Cargo.toml

Hyphenation: enable the Danish hypher patterns (#2282) (#2293)

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