FA-8121 / Menu interactions / Open access

Menu item activation: Checked menu checkboxes cannot toggle off · case 01

Checked menu checkboxes cannot toggle off.

Verified by executionVariant 1 · 9 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The checkbox operation uses `(opened, True, 'change')` where the contract requires `(opened, not checked, 'change')`.

THE FAILURE

The checkbox operation uses `(opened, True, 'change')` where the contract requires `(opened, not checked, 'change')`.

Unsuccessful approach: Closing the menu violates the persistent checkbox menu contract.

Case contract

Disabled items and nonactivation keys do nothing; click, Enter and Space activate; submenu transfers focus; checks toggle; radios select; leaf commands close.

Why this case matters

A deterministic model of menu item activation; this isolates one interface invariant without requiring a browser.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(item, opened, checked, event):
    if item['disabled']: return (opened, checked, None)
    if event not in ('click', 'Enter', 'Space'): return (opened, checked, None)
    if item['kind'] == 'submenu': return (True, checked, 'focus-child')
    if item['kind'] == 'checkbox': return (opened, True, 'change')
    if item['kind'] == 'radio': return (opened, True, 'change')
    return (False, checked, 'invoke')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('disabled', solve(dict(disabled=True,kind='command'), True, False, 'click'), (True, False, None))
check('enter', solve(dict(disabled=False,kind='command'), True, False, 'Enter'), (False, False, 'invoke'))
check('space', solve(dict(disabled=False,kind='command'), True, False, 'Space'), (False, False, 'invoke'))
check('submenu', solve(dict(disabled=False,kind='submenu'), False, False, 'click'), (True, False, 'focus-child'))
check('checkbox off', solve(dict(disabled=False,kind='checkbox'), True, True, 'click'), (True, False, 'change'))
check('radio stays', solve(dict(disabled=False,kind='radio'), True, True, 'click'), (True, True, 'change'))
check('ignore arrow', solve(dict(disabled=False,kind='command'), True, False, 'Left'), (True, False, None))
check('parameterized checked state', solve(dict(disabled=False,kind='checkbox'), True, bool(N%2), 'Space'), (True, not bool(N%2), 'change'))
for repetition in range(N):
    check('repeat ignore arrow', solve(dict(disabled=False,kind='command'), True, False, 'Left'), (True, False, None))
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 fixture	Actual	Expected	Outcome
disabled	`[True, False, None]`	`[True, False, None]`	Passed
enter	`[False, False, 'invoke']`	`[False, False, 'invoke']`	Passed
space	`[False, False, 'invoke']`	`[False, False, 'invoke']`	Passed
submenu	`[True, False, 'focus-child']`	`[True, False, 'focus-child']`	Passed
checkbox off	`[True, True, 'change']`	`[True, False, 'change']`	Failed
radio stays	`[True, True, 'change']`	`[True, True, 'change']`	Passed
ignore arrow	`[True, False, None]`	`[True, False, None]`	Passed
parameterized checked state	`[True, True, 'change']`	`[True, False, 'change']`	Failed
repeat ignore arrow	`[True, False, None]`	`[True, False, None]`	Passed

SHA-256 / ad047ef0a0f222be816d14eb152d6e4fdbba511653fdc106350f66507640cda0

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(item, opened, checked, event):
    if item['disabled']: return (opened, checked, None)
    if event not in ('click', 'Enter', 'Space'): return (opened, checked, None)
    if item['kind'] == 'submenu': return (True, checked, 'focus-child')
    if item['kind'] == 'checkbox': return (False, not checked, 'change')
    if item['kind'] == 'radio': return (opened, True, 'change')
    return (False, checked, 'invoke')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('disabled', solve(dict(disabled=True,kind='command'), True, False, 'click'), (True, False, None))
check('enter', solve(dict(disabled=False,kind='command'), True, False, 'Enter'), (False, False, 'invoke'))
check('space', solve(dict(disabled=False,kind='command'), True, False, 'Space'), (False, False, 'invoke'))
check('submenu', solve(dict(disabled=False,kind='submenu'), False, False, 'click'), (True, False, 'focus-child'))
check('checkbox off', solve(dict(disabled=False,kind='checkbox'), True, True, 'click'), (True, False, 'change'))
check('radio stays', solve(dict(disabled=False,kind='radio'), True, True, 'click'), (True, True, 'change'))
check('ignore arrow', solve(dict(disabled=False,kind='command'), True, False, 'Left'), (True, False, None))
check('parameterized checked state', solve(dict(disabled=False,kind='checkbox'), True, bool(N%2), 'Space'), (True, not bool(N%2), 'change'))
for repetition in range(N):
    check('repeat ignore arrow', solve(dict(disabled=False,kind='command'), True, False, 'Left'), (True, False, None))
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 fixture	Actual	Expected	Outcome
disabled	`[True, False, None]`	`[True, False, None]`	Passed
enter	`[False, False, 'invoke']`	`[False, False, 'invoke']`	Passed
space	`[False, False, 'invoke']`	`[False, False, 'invoke']`	Passed
submenu	`[True, False, 'focus-child']`	`[True, False, 'focus-child']`	Passed
checkbox off	`[False, False, 'change']`	`[True, False, 'change']`	Failed
radio stays	`[True, True, 'change']`	`[True, True, 'change']`	Passed
ignore arrow	`[True, False, None]`	`[True, False, None]`	Passed
parameterized checked state	`[False, False, 'change']`	`[True, False, 'change']`	Failed
repeat ignore arrow	`[True, False, None]`	`[True, False, None]`	Passed

SHA-256 / ae32c515e6bd2c0a37bd1994196c3258032e826b30bdfeef2c5ecd2c9966cebf

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 9 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

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 2026-09-29T14:38:18.583747+00:00.

Case digest / de5e6419fc425962ddebf194841e6e85bfc6943b07ae28b6a520f5b1aee640d9