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FA-36676 / Tab interfaces / Open access

Tab audible status: mute toggle target · case 01

The tab workspace reports an incorrect mute toggle target.

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

ROOT CAUSE

The mute toggle target decision uses x['tabs'] instead of [t for t in x['muted'] if t!=x['target']] if x['target'] in x['muted'] else x['muted']+[x['target']].

THE FAILURE

The mute toggle target decision uses x['tabs'] instead of [t for t in x['muted'] if t!=x['target']] if x['target'] in x['muted'] else x['muted']+[x['target']].

Unsuccessful approach: The partial repair [x['target']] still violates a workspace boundary or normal case.

Case contract

Tab audio indicators distinguish currently audible, explicitly muted, and media-capture states. Muting changes only the selected tab policy and does not stop capture. The separate Stop Capture command removes only its target from the capture set.

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 = [t for t in x['tabs'] if t in x['audible'] and t not in x['muted']]
    r1 = x['muted']
    r2 = x['capture']
    r3 = x['tabs']
    r4 = [t for t in x['capture'] if t!=x['target']]
    r5 = 'Unmute tab' if x['target'] in x['muted'] else 'Mute tab'
    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: [({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 2: [({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 3: [({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 4: [({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 5: [({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])]}
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[['a'], ['b'], ['c'], ['a', 'b', 'c'], ['c'], 'Mute tab'][['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']Failed
workspace regression 1[['a'], ['b'], ['c'], ['a', 'b', 'c'], ['c'], 'Unmute tab'][['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']Failed
workspace regression 2[[], ['b'], ['c'], ['a', 'b', 'c'], ['c'], 'Mute tab'][[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']Failed
workspace regression 3[['a'], ['b'], ['a', 'c'], ['a', 'b', 'c'], ['c'], 'Mute tab'][['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']Failed
workspace regression 4[['a', 'b'], [], ['c'], ['a', 'b', 'c'], ['c'], 'Mute tab'][['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']Failed
workspace regression 5[['a'], ['b'], ['c'], ['a', 'b', 'c'], [], 'Mute tab'][['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab']Failed

SHA-256 / 1271854a1f4110853b6c9a35fa3f6d31e67510df030a074b44488d6cefbb4524

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(x):
    r0 = [t for t in x['tabs'] if t in x['audible'] and t not in x['muted']]
    r1 = x['muted']
    r2 = x['capture']
    r3 = [x['target']]
    r4 = [t for t in x['capture'] if t!=x['target']]
    r5 = 'Unmute tab' if x['target'] in x['muted'] else 'Mute tab'
    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: [({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 2: [({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 3: [({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 4: [({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])], 5: [({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'b'}, [['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': [], 'muted': ['b'], 'capture': ['c'], 'target': 'a'}, [[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['a', 'c'], 'target': 'a'}, [['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': [], 'capture': ['c'], 'target': 'a'}, [['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']), ({'tabs': ['a', 'b', 'c', 'background0', 'background1', 'background2', 'background3'], 'audible': ['a', 'b'], 'muted': ['b'], 'capture': ['c'], 'target': 'c'}, [['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab'])]}
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[['a'], ['b'], ['c'], ['a'], ['c'], 'Mute tab'][['a'], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']Failed
workspace regression 1[['a'], ['b'], ['c'], ['b'], ['c'], 'Unmute tab'][['a'], ['b'], ['c'], [], ['c'], 'Unmute tab']Failed
workspace regression 2[[], ['b'], ['c'], ['a'], ['c'], 'Mute tab'][[], ['b'], ['c'], ['b', 'a'], ['c'], 'Mute tab']Failed
workspace regression 3[['a'], ['b'], ['a', 'c'], ['a'], ['c'], 'Mute tab'][['a'], ['b'], ['a', 'c'], ['b', 'a'], ['c'], 'Mute tab']Failed
workspace regression 4[['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab'][['a', 'b'], [], ['c'], ['a'], ['c'], 'Mute tab']Passed
workspace regression 5[['a'], ['b'], ['c'], ['c'], [], 'Mute tab'][['a'], ['b'], ['c'], ['b', 'c'], [], 'Mute tab']Failed

SHA-256 / 74a7238dfd1ccd04966ecc108fd6b9ce3d3cf9c7de41ae962f920de055dc9612

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.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

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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 2026-09-29T14:42:53.807582+00:00.

Case digest / f5a8f5101cb487d123c0a39041e5e8000a635649f4983435008c5a38c6ad6549