Sokhi: tracks occasionally land in Rockbox's 'untagged' bucket after a
'processing failed'. enhance_file_metadata saves the file with tags CLEARED up
front (so stale tags never linger), then runs the failure-prone external steps
(source-id embed, cover-art fetch). The core tags (album/artist/title/track from
the matched context) are written to the in-memory object BEFORE those steps, but
the on-disk file is still the cleared one until the final save.
The #764 fix made the error handler restore ART — but gated the re-save on there
being original art to restore. So a file with NO embedded art that hit a
mid-enrichment crash threw away its in-memory core tags and was left on disk as
the up-front clear saved it: untagged. Now the handler always persists the
in-memory tags (restoring art when present), so a crash leaves a correctly-tagged
file (album tag intact -> right bucket) instead of an empty one. Regression test
drives the real enhance_file_metadata against an art-less FLAC.
3b0394dbc6