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Patrick Buckley
4f6ef13ce9
The cancel endpoint emitted a 'cancelled' SSE event before the worker thread terminated. The frontend transitioned to "send" mode prematurely, so the next send got rejected with "Already processing a request." Backend: - Providers expose SDK stream handle via cancel_ref parameter so cancel() can close the HTTP connection and unblock iteration - Generation counter prevents orphaned threads from mutating messages or clearing cancel state after force cancel - _check_cancelled() added between retry attempts in _try_stream - Server polls (async, non-blocking) for cancelled worker to exit - Force cancel (force:true) abandons stuck worker, keeps cancel event set so subprocesses are killed, guards against spurious SSE events Frontend: - 'cancelled' shows "Cancelling..." then escalates to "Force Stop" after 2s for a harder cancel that abandons the worker immediately - 10s safety timeout auto-recovers if stream_end never arrives - busy_error re-enables stop button instead of showing send - Timeout cleanup in disconnectSSE, stream_end, and force .then() - Layout shift prevention (min-width, white-space: nowrap) - aria-label updates for accessibility Tests: - 7 new tests: stream close, error suppression, cancel_ref population, transport error conversion, non-cancel exception propagation, retry cancellation check
