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nesquena-hermes
6baf501dce
Opus found the exact-match signature fails open in the COMMON case: the server's last persisted draft is often a PREFIX of the submitted text (Enter-to-send within 400ms cancels the pending debounced save), so matching only the submitted text misses it and the prefix restores (the literal 'tail of the already-submitted message' symptom). Root fix (Opus-recommended): capture BOTH signatures at send — the remembered SERVER-draft signature (_composerDraftPayloadSignatureForSid, read before the reset) AND the submitted-payload signature — and suppress a restore matching EITHER. The prefix IS the remembered server draft; the remembered files went through the same lossy serialization so they self-match; a genuinely new cross-tab draft matches neither and restores. Subsumes the file-canonicalization fix (kept as belt-and-suspenders). Suppression stores signatures[] not signature. Regression tests: stale-prefix suppressed (Opus Finding 1), file round-trip self-matches (Codex Finding 2), cross-tab-different still restores. Test harness updated to model send-time server draft vs later restore draft as distinct. Co-authored-by: ruizanthony <ruizanthony@users.noreply.github.com>
