{"abstract":"Shift-Tab moves focus forward.","category":"Text editing","checks":10,"contract":"Composition state or legacy code 229 delegates to native input; plain multiline Enter inserts newline; other Enter submits; Escape preserves draft; Tab honors Shift.","contract_signature":"key, composing, code, shift, multiline, value","evaluation_group":"xi-ime-keys","failed_approach":"Always moving backward breaks ordinary Tab.","family":"xi-ime-keys-shift-tab","id":"FA-9001","implementations":{"attempt":{"sha256":"634b9566ea6c15d559c962f1829b11be9aca89c36c4cd1d11efb6d7911e3e5bb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(key, composing, code, shift, multiline, value):\n    if composing or code == 229: return ('native', value)\n    if key == 'Enter':\n        if multiline and not shift: return ('insert', value + '\\n')\n        return ('submit', value)\n    if key == 'Escape': return ('cancel', value)\n    if key == 'Tab': return ('previous', value)\n    return ('native', value)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('composition', solve('Enter', True, 13, False, False, 'draft'), ('native', 'draft'))\ncheck('legacy', solve('Enter', False, 229, False, False, 'draft'), ('native', 'draft'))\ncheck('single', solve('Enter', False, 13, False, False, 'draft'), ('submit', 'draft'))\ncheck('multiline', solve('Enter', False, 13, False, True, 'draft'), ('insert', 'draft\\n'))\ncheck('shift submit', solve('Enter', False, 13, True, True, 'draft'), ('submit', 'draft'))\ncheck('escape', solve('Escape', False, 27, False, False, 'draft'), ('cancel', 'draft'))\ncheck('shift tab', solve('Tab', False, 9, True, False, 'draft'), ('previous', 'draft'))\ncheck('tab', solve('Tab', False, 9, False, False, 'draft'), ('next', 'draft'))\ncheck('parameterized composition text', solve('Enter',True,13,False,False,'draft'+str(N)), ('native','draft'+str(N)))\nfor repetition in range(N):\n    check('repeat tab', solve('Tab', False, 9, False, False, 'draft'), ('next', 'draft'))\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"57220b8ec44aa818ba05c1ed4ae5177d6853b7af7dfc0f102f1eb360d31926dc","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(key, composing, code, shift, multiline, value):\n    if composing or code == 229: return ('native', value)\n    if key == 'Enter':\n        if multiline and not shift: return ('insert', value + '\\n')\n        return ('submit', value)\n    if key == 'Escape': return ('cancel', value)\n    if key == 'Tab': return ('next', value)\n    return ('native', value)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('composition', solve('Enter', True, 13, False, False, 'draft'), ('native', 'draft'))\ncheck('legacy', solve('Enter', False, 229, False, False, 'draft'), ('native', 'draft'))\ncheck('single', solve('Enter', False, 13, False, False, 'draft'), ('submit', 'draft'))\ncheck('multiline', solve('Enter', False, 13, False, True, 'draft'), ('insert', 'draft\\n'))\ncheck('shift submit', solve('Enter', False, 13, True, True, 'draft'), ('submit', 'draft'))\ncheck('escape', solve('Escape', False, 27, False, False, 'draft'), ('cancel', 'draft'))\ncheck('shift tab', solve('Tab', False, 9, True, False, 'draft'), ('previous', 'draft'))\ncheck('tab', solve('Tab', False, 9, False, False, 'draft'), ('next', 'draft'))\ncheck('parameterized composition text', solve('Enter',True,13,False,False,'draft'+str(N)), ('native','draft'+str(N)))\nfor repetition in range(N):\n    check('repeat tab', solve('Tab', False, 9, False, False, 'draft'), ('next', 'draft'))\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xi-ime-keys-shift-tab","generated_at":"2026-09-29T14:38:26.215105+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic model of composition-aware keyboard commands; this isolates one interface invariant without requiring a browser.","root_cause":"The shift tab operation uses `'next'` where the contract requires `'previous' if shift else 'next'`.","sha256":"1c20ed3e915fdb09f9372365db8b76a511b00c5dae27085e46f2ad4d117c43d6","title":"Composition-aware keyboard commands: Shift-Tab moves focus forward · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":37.274,"exit_code":1,"observations":[{"actual":["native","draft"],"check":"composition","expected":["native","draft"],"passed":true},{"actual":["native","draft"],"check":"legacy","expected":["native","draft"],"passed":true},{"actual":["submit","draft"],"check":"single","expected":["submit","draft"],"passed":true},{"actual":["insert","draft\n"],"check":"multiline","expected":["insert","draft\n"],"passed":true},{"actual":["submit","draft"],"check":"shift submit","expected":["submit","draft"],"passed":true},{"actual":["cancel","draft"],"check":"escape","expected":["cancel","draft"],"passed":true},{"actual":["previous","draft"],"check":"shift tab","expected":["previous","draft"],"passed":true},{"actual":["previous","draft"],"check":"tab","expected":["next","draft"],"passed":false},{"actual":["native","draft1"],"check":"parameterized composition text","expected":["native","draft1"],"passed":true},{"actual":["previous","draft"],"check":"repeat tab","expected":["next","draft"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"composition\", \"actual\": [\"native\", \"draft\"], \"expected\": [\"native\", \"draft\"], \"passed\": true}, {\"check\": \"legacy\", \"actual\": [\"native\", \"draft\"], \"expected\": [\"native\", \"draft\"], \"passed\": true}, {\"check\": \"single\", \"actual\": [\"submit\", \"draft\"], \"expected\": [\"submit\", \"draft\"], \"passed\": true}, {\"check\": \"multiline\", \"actual\": [\"insert\", \"draft\\n\"], \"expected\": [\"insert\", \"draft\\n\"], \"passed\": true}, {\"check\": \"shift submit\", \"actual\": [\"submit\", \"draft\"], \"expected\": [\"submit\", \"draft\"], \"passed\": true}, {\"check\": \"escape\", \"actual\": [\"cancel\", \"draft\"], \"expected\": [\"cancel\", \"draft\"], \"passed\": true}, {\"check\": \"shift tab\", \"actual\": [\"previous\", \"draft\"], \"expected\": [\"previous\", \"draft\"], \"passed\": true}, {\"check\": \"tab\", \"actual\": [\"previous\", \"draft\"], \"expected\": [\"next\", \"draft\"], \"passed\": false}, {\"check\": \"parameterized composition text\", \"actual\": [\"native\", \"draft1\"], \"expected\": [\"native\", \"draft1\"], \"passed\": true}, {\"check\": \"repeat tab\", \"actual\": [\"previous\", \"draft\"], \"expected\": [\"next\", \"draft\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.445,"exit_code":1,"observations":[{"actual":["native","draft"],"check":"composition","expected":["native","draft"],"passed":true},{"actual":["native","draft"],"check":"legacy","expected":["native","draft"],"passed":true},{"actual":["submit","draft"],"check":"single","expected":["submit","draft"],"passed":true},{"actual":["insert","draft\n"],"check":"multiline","expected":["insert","draft\n"],"passed":true},{"actual":["submit","draft"],"check":"shift submit","expected":["submit","draft"],"passed":true},{"actual":["cancel","draft"],"check":"escape","expected":["cancel","draft"],"passed":true},{"actual":["next","draft"],"check":"shift tab","expected":["previous","draft"],"passed":false},{"actual":["next","draft"],"check":"tab","expected":["next","draft"],"passed":true},{"actual":["native","draft1"],"check":"parameterized composition text","expected":["native","draft1"],"passed":true},{"actual":["next","draft"],"check":"repeat tab","expected":["next","draft"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"composition\", \"actual\": [\"native\", \"draft\"], \"expected\": [\"native\", \"draft\"], \"passed\": true}, {\"check\": \"legacy\", \"actual\": [\"native\", \"draft\"], \"expected\": [\"native\", \"draft\"], \"passed\": true}, {\"check\": \"single\", \"actual\": [\"submit\", \"draft\"], \"expected\": [\"submit\", \"draft\"], \"passed\": true}, {\"check\": \"multiline\", \"actual\": [\"insert\", \"draft\\n\"], \"expected\": [\"insert\", \"draft\\n\"], \"passed\": true}, {\"check\": \"shift submit\", \"actual\": [\"submit\", \"draft\"], \"expected\": [\"submit\", \"draft\"], \"passed\": true}, {\"check\": \"escape\", \"actual\": [\"cancel\", \"draft\"], \"expected\": [\"cancel\", \"draft\"], \"passed\": true}, {\"check\": \"shift tab\", \"actual\": [\"next\", \"draft\"], \"expected\": [\"previous\", \"draft\"], \"passed\": false}, {\"check\": \"tab\", \"actual\": [\"next\", \"draft\"], \"expected\": [\"next\", \"draft\"], \"passed\": true}, {\"check\": \"parameterized composition text\", \"actual\": [\"native\", \"draft1\"], \"expected\": [\"native\", \"draft1\"], \"passed\": true}, {\"check\": \"repeat tab\", \"actual\": [\"next\", \"draft\"], \"expected\": [\"next\", \"draft\"], \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}