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A library shared by two groups arrived in the cross-group Search view as
two entries per file: every film was two poster cards, every episode was
listed twice in the season list under the synopsis. Inside one group
this cannot happen — GroupIndex is keyed by blake3 — so the duplication
was the Search page's own, from concatenating N independently keyed
indexes.
source-merge.js folds entries on the content hash and resolves one
source per *unit* (a film, a whole show), so a season does not scatter
across two nodes. A group hosted by the reader's own node wins; failing
that the pick is a hash of the unit key and the reader's id, stable
across renders and reloads — a source that changed mid-stream would tear
down the connection under a film that is playing — and spread across
readers and units.
The units come from video-app.js's own groupVideoEntries rather than a
second copy of its keys here. Only the Videos view is wired up so far;
Music, Photos, failover and the "N sources" badge are phases 5-8 of
docs/refactoring-search.md.
Every test was checked against the fix removed. That is how the first
version of "a unit's files share its source" turned out to prove
nothing: with every episode in every group, per-file and per-unit
picking give the same answer, so it passed against a per-file
implementation. It now uses a unit whose files have unequal sources.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AbwJDbNTkiRUh7HTWEoyss
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