A source row with no art of its own (e.g. a YouTube source, which provides
none at mirror time) now borrows the cover from its MATCHED server track, so
both sides of the sync editor show an image.
The endpoint already had a borrow fallback (_server_art_map), but it matched by
an exact normalized "{artist}|{title}" key — so a YouTube-shaped row like
"Arctic Monkeys - Do I Wanna Know?" never matched the library's "Do I Wanna
Know?" and stayed blank even though the server had the cover. This borrow is
keyed off the ACTUAL source<->server pairing the reconcile already computed, so
it works for those rows once #768's canonical matching pairs them.
Done in the pure reconcile_playlist (final pass), so no frontend change is
needed — the editor already renders source_track.image_url. Guarded so it only
fills an EMPTY source image (Spotify/CDN art is never overwritten) and only when
the matched server track actually has a thumb.
Composes with the rest: #766 made the server cover URL work, #768 made the
YouTube row match, this makes the matched source row borrow that cover — so an
artless YouTube row matched to a Navidrome track with art shows on both sides.
Tests: tests/test_playlist_reconcile.py (+4) — artless source borrows the
matched cover; source with its own art keeps it; unmatched source has nothing to
borrow; borrow skipped when the server track has no thumb. 15 reconcile + 59
sync/navidrome tests pass.
Three compounding bugs hit tracks whose source metadata is YouTube/streaming-
shaped — title "Artist - Song", artist "Official Artist"/"Artist - Topic"/
"ArtistVEVO" (reported: "Arctic Monkeys - Do I Wanna Know?" by "Official Arctic
Monkeys"). Server-agnostic — affects Plex/Jellyfin/Navidrome, not just the
reporter's Navidrome.
Bug A — the match fails. The confidence scorer and the editor's reconcile both
compared the raw "Artist - Song" title against the library's clean "Song"; the
length-ratio penalty + floor drove it to ~0.18 (NO-MATCH), so the track showed
unmatched while its server copy showed as an orphan "extra". New pure
core/text/source_title.py (clean_source_artist / strip_artist_prefix /
canonical_source_track) strips the channel/video decoration, applied at BOTH
matching seams: services/sync_service._find_track_in_media_server (tries raw
then canonical, keeps the best) and the editor reconcile. Conservative: a title
prefix is stripped only when it equals the artist, so "Self-Titled", "Jay-Z",
and "Marvin Gaye" (by another artist) are untouched, and the canonical form is
an additional best-of candidate so it can only help.
Bug B — manual matches never persisted. get_server_playlist_tracks built the
per-source entry WITHOUT source_track_id, so "Find & add" posted an empty id
and _persist_find_and_add_match returned early. The match reverted to "extra"
on reload and re-adding looped. The editor's 3-pass matcher is now lifted to a
pure, tested core.sync.playlist_reconcile.reconcile_playlist that includes
source_track_id (the frontend at pages-extra.js:1836 already reads + sends it).
Bug C — manual match duplicated + delete wiped all copies. "Find & add" always
inserted, so linking a source to an already-present server track appended a
duplicate (pos 72, 73...); remove filtered out EVERY entry with the target id.
New pure core.sync.playlist_edit (plan_playlist_add: link-don't-duplicate when
the target is already present; remove_one_occurrence: drop a single copy) wired
into the Plex/Jellyfin/Navidrome add + remove branches.
Tests (extreme): tests/test_source_title.py (35), tests/test_playlist_reconcile.py
(11 — incl. the reported case, parity for override/exact/fuzzy/extra, and
duplicate-server handling), tests/test_playlist_edit.py (12). 286 matching/sync
tests still pass.
Caveats: the sync_service change and the add/remove/editor endpoints are
read-verified, not executed against a live media server (none in CI). The pure
cores they call are exhaustively unit-tested; output-shape parity of the
reconcile lift is covered. Delete removes the first matching copy (duplicates
are identical, so harmless).
