apollographql / apollo-client / 7404

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Use previous results for fields from custom resolvers

A logic error was causing the `readStoreResolver` from applying
a `previousResult` to a top-level ID obtained via a custom resolver.

Effectively, this bug was causing the result of any query routed through
a custom resolver to fail reference equality checks, even if the result
is served completely from the cache and is completely unchanged.

This commit adds a regression test.

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