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FAILURE MAP
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FA-35956 / Tab interfaces / Open access

Tab group collapse: active placeholder · case 01

The tab workspace reports an incorrect active placeholder.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The active placeholder decision uses None instead of x['active'] if x['collapsed'] and x['active'] in x['members'] else None.

THE FAILURE

The active placeholder decision uses None instead of x['active'] if x['collapsed'] and x['active'] in x['members'] else None.

Unsuccessful approach: The partial repair x['active'] if x['collapsed'] else None still violates a workspace boundary or normal case.

Case contract

Collapsed tab groups display only a header and active member placeholder; preserve membership, count dirty documents and expand before revealing an inactive member.

Why this case matters

Offline tab/panel workspace behavior; no browser or desktop framework is emulated.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    r0 = ([x['active']] if x['active'] in x['members'] else []) if x['collapsed'] else x['members']
    r1 = len(x['members'])
    r2 = sum(t in x['dirty'] for t in x['members'])
    r3 = None
    r4 = x['collapsed'] and x['reveal'] in x['members'] and x['reveal']!=x['active']
    r5 = x['members']
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 3, 2, 'b', True, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c'], 3, 2, None, False, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 3, 2, None, True, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 3, 0, 'b', True, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 3, 2, 'b', False, ['a', 'b', 'c']]), ({'members': [], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 0, 0, None, False, []])], 2: [({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 4, 2, 'b', True, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0'], 4, 2, None, False, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 4, 2, None, True, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 4, 0, 'b', True, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 4, 2, 'b', False, ['a', 'b', 'c', 'extra0']]), ({'members': ['extra0'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 1, 0, None, False, ['extra0']])], 3: [({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 5, 2, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0', 'extra1'], 5, 2, None, False, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 5, 2, None, True, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 5, 0, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 5, 2, 'b', False, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 2, 0, None, False, ['extra0', 'extra1']])], 4: [({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 6, 2, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 6, 2, None, False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 6, 2, None, True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 6, 0, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 6, 2, 'b', False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 3, 0, None, False, ['extra0', 'extra1', 'extra2']])], 5: [({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 7, 2, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 7, 2, None, False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 7, 2, None, True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 7, 0, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 7, 2, 'b', False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 4, 0, None, False, ['extra0', 'extra1', 'extra2', 'extra3']])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
workspace regression 0[['b'], 3, 2, None, True, ['a', 'b', 'c']][['b'], 3, 2, 'b', True, ['a', 'b', 'c']]Failed
workspace regression 1[['a', 'b', 'c'], 3, 2, None, False, ['a', 'b', 'c']][['a', 'b', 'c'], 3, 2, None, False, ['a', 'b', 'c']]Passed
workspace regression 2[[], 3, 2, None, True, ['a', 'b', 'c']][[], 3, 2, None, True, ['a', 'b', 'c']]Passed
workspace regression 3[['b'], 3, 0, None, True, ['a', 'b', 'c']][['b'], 3, 0, 'b', True, ['a', 'b', 'c']]Failed
workspace regression 4[['b'], 3, 2, None, False, ['a', 'b', 'c']][['b'], 3, 2, 'b', False, ['a', 'b', 'c']]Failed
workspace regression 5[[], 0, 0, None, False, []][[], 0, 0, None, False, []]Passed

SHA-256 / d29dcb0e0b4eeddbcba08afc1f9f2be3c94f45cc8f94c05fe3e5615481aebfbf

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    r0 = ([x['active']] if x['active'] in x['members'] else []) if x['collapsed'] else x['members']
    r1 = len(x['members'])
    r2 = sum(t in x['dirty'] for t in x['members'])
    r3 = x['active'] if x['collapsed'] else None
    r4 = x['collapsed'] and x['reveal'] in x['members'] and x['reveal']!=x['active']
    r5 = x['members']
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 3, 2, 'b', True, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c'], 3, 2, None, False, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 3, 2, None, True, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 3, 0, 'b', True, ['a', 'b', 'c']]), ({'members': ['a', 'b', 'c'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 3, 2, 'b', False, ['a', 'b', 'c']]), ({'members': [], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 0, 0, None, False, []])], 2: [({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 4, 2, 'b', True, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0'], 4, 2, None, False, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 4, 2, None, True, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 4, 0, 'b', True, ['a', 'b', 'c', 'extra0']]), ({'members': ['a', 'b', 'c', 'extra0'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 4, 2, 'b', False, ['a', 'b', 'c', 'extra0']]), ({'members': ['extra0'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 1, 0, None, False, ['extra0']])], 3: [({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 5, 2, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0', 'extra1'], 5, 2, None, False, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 5, 2, None, True, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 5, 0, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 5, 2, 'b', False, ['a', 'b', 'c', 'extra0', 'extra1']]), ({'members': ['extra0', 'extra1'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 2, 0, None, False, ['extra0', 'extra1']])], 4: [({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 6, 2, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 6, 2, None, False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 6, 2, None, True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 6, 0, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 6, 2, 'b', False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2']]), ({'members': ['extra0', 'extra1', 'extra2'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 3, 0, None, False, ['extra0', 'extra1', 'extra2']])], 5: [({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['b'], 7, 2, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': False, 'dirty': ['a', 'c'], 'reveal': 'c'}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 7, 2, None, False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'z', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 7, 2, None, True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': [], 'reveal': 'c'}, [['b'], 7, 0, 'b', True, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'b'}, [['b'], 7, 2, 'b', False, ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3']]), ({'members': ['extra0', 'extra1', 'extra2', 'extra3'], 'active': 'b', 'collapsed': True, 'dirty': ['a', 'c'], 'reveal': 'c'}, [[], 4, 0, None, False, ['extra0', 'extra1', 'extra2', 'extra3']])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
workspace regression 0[['b'], 3, 2, 'b', True, ['a', 'b', 'c']][['b'], 3, 2, 'b', True, ['a', 'b', 'c']]Passed
workspace regression 1[['a', 'b', 'c'], 3, 2, None, False, ['a', 'b', 'c']][['a', 'b', 'c'], 3, 2, None, False, ['a', 'b', 'c']]Passed
workspace regression 2[[], 3, 2, 'z', True, ['a', 'b', 'c']][[], 3, 2, None, True, ['a', 'b', 'c']]Failed
workspace regression 3[['b'], 3, 0, 'b', True, ['a', 'b', 'c']][['b'], 3, 0, 'b', True, ['a', 'b', 'c']]Passed
workspace regression 4[['b'], 3, 2, 'b', False, ['a', 'b', 'c']][['b'], 3, 2, 'b', False, ['a', 'b', 'c']]Passed
workspace regression 5[[], 0, 0, 'b', False, []][[], 0, 0, None, False, []]Failed

SHA-256 / ebebf974d1f9c37887e479db04b05e379153ea6beb27c5409af0107f41b61d13

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 6 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Finite stipulated workspace snapshots only. Independent result fields describe observable obligations, not a full UI runtime. 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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:42:46.635487+00:00.

Case digest / 174ccc3f114b452b2b0e0b8a88ee77dc9179c24f81a5638fa104e1967193a287