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Tobias GesellchenandClaude Opus 4.8
393b31ad93
Re-playing an existing recent could make it (and its list neighbour)
vanish from the speaker's recents, even with the list well under the
10-item cap. Root cause is a slice-aliasing bug in updateOrCreateRecent's
move-to-front branch:
recentObj = &recents[i]
recents = append([]ServiceRecent{*recentObj}, append(recents[:i], recents[i+1:]...)...)
return recentObj, recents
The inner append(recents[:i], recents[i+1:]...) shifts elements left in
place in the shared backing array, overwriting slot i. The returned
recentObj still points at &recents[i], so it leaks the neighbouring
recent back to the speaker. Worse, Go does not specify evaluation order
between the *recentObj dereference and the inner append call, so the
front element written into the saved list can also read the overwritten
slot, dropping the matched recent and duplicating its neighbour. The
SaveRecents dedup-by-ID guard then collapses that duplicate into a clean
loss.
Verified against recorded interactions (a "White Water" replay returned
the "Sand Castle" recent; both Spotify albums vanished from a 9-item
list) and a live diagnostic export (6 persisted recents, no duplicates,
both albums gone).
Fix: copy the matched recent out first, rebuild into a fresh backing
array, and return a pointer into the new slice. Adds a regression test
that fails on the old code and passes now.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>