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* fix: split tag values from multiple sources individually When a file has multiple tag frames mapping to the same logical tag (e.g. both TXXX:MOOD and TMOO), TagLib merges them into one key with multiple values. SplitTagValue had a len(values) != 1 guard that skipped splitting entirely in this case, leaving comma-separated values unsplit. Change SplitTagValue to split each value individually regardless of input count. Empty values are filtered during splitting. Fixes #5065 * test: cover SplitTagValue with multi-frame regression cases Add tests pinning the behavior fixed by SplitTagValue iterating over each input value. The previous len(values) != 1 short-circuit silently skipped splitting whenever TagLib merged multiple ID3v2 frames into the same property (e.g. TMOO + TXXX:MOOD for mood, or duplicate TIPL entries for composer), as reported in #5065. Three layers of coverage: - model/tag_mappings_test.go: direct unit tests on TagConf.SplitTagValue covering single/multi-value input, case-insensitive separators, missing SplitRx, empty input, and the empty-strings-passed-through contract that the downstream metadata pipeline relies on. - model/metadata/metadata_test.go: end-to-end check that a "mood" tag surfaced as two raw values (the exact shape from the bug report) is split, trimmed, and deduplicated to the expected three moods. - model/metadata/map_participants_test.go: parallel multi-value case for the COMPOSER tag, ensuring the same fix also corrects multi-frame role parsing. All three new specs fail on the pre-fix code and pass on the patched SplitTagValue. --------- Co-authored-by: Deluan Quintão <deluan@navidrome.org>