Two follow-ups to the multi-artist tag settings PR:
1. Deezer contributors upgrade — closes the "known limitation"
flagged in the prior commit. Deezer's `/search` endpoint only
returns the primary artist for each track; the full contributors
array (feat., remix collaborators, producers credited as artists)
lives on `/track/<id>` and gets parsed by `_build_enhanced_track`.
Without the upgrade Deezer-sourced tracks never got multi-artist
tags even with the right settings on.
Fix in `core/metadata/source.py`: when source==deezer AND the
search response had a single artist AND a track_id is available,
fetch full track details via `get_deezer_client().get_track_details`
and replace `all_artists` with the upgraded list.
- One extra API call per affected Deezer track
- Skipped when search already returned multiple (no-op fast path)
- Skipped for non-Deezer sources (Spotify/Tidal/iTunes search
responses already include all artists)
- Skipped when no track_id is available
- Defensive try/except: on /track/<id> failure (network error,
deezer client unavailable), fall through to the search-result
list — never lose the data we already had
2. Double-append guard hardened with a word-boundary regex.
Prior commit checked for `"feat." not in title.lower() and "(ft."
not in title.lower()` — too narrow. Source platforms produce
wildly different feat-marker conventions: "(feat. X)", "(Feat X)",
"(FEAT X)", "(Featuring X)", "[feat. X]", "ft. X" (no parens),
"FT. X", etc. Any of these as the SOURCE title would cause a
double-append: `"Track (Feat X) (feat. Y)"`.
Replaced with `re.search(r'\b(?:feat|feat\.|featuring|ft|ft\.)\b',
title, IGNORECASE)`. Word-boundary regex catches every common
variant. Substring matches like "Aftermath" containing `ft`
correctly fall through to the append path (pinned by a regression
test).
16 new tests (29 total in the file):
- 9 parametrized variants of the double-append guard
- 1 substring guard ("Aftermath")
- 6 Deezer upgrade scenarios (fires when expected, doesn't fire
for non-Deezer / multi-artist search / no track_id, defensive
fall-through on failure, no false-positive when /track/<id>
confirms single artist)
Full pytest 2727 passed.
d5de724f9b