When a deep directory was renamed or deleted externally and both the
directory itself and a parent directory were cached, only the self entry
was cleared — leaving the parent's children list holding a ghost reference
to the old child. Walk up to the nearest cached ancestor in addition to
the direct hit so both stale entries are dropped together.
Also gate the follow-up getFileTree refetch on the directory still being
expanded. Collapsed branches only need their cache cleared; they will
re-hydrate naturally on the next expansion, which avoids unnecessary IPC
traffic during FS event bursts.
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