FA-23316 / Autocomplete interactions / Open access

Reopening a committed autocomplete: editing compares to a previously selected label instead of current one · case 01

The baseline completion transition produces an incorrect observable state.

Verified by executionVariant 1 · 22 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

At completion-draft-history/baseline, the implementation evaluates `d['prior_label']` instead of preserving the specified completion transition.

THE FAILURE

At completion-draft-history/baseline, the implementation evaluates `d['prior_label']` instead of preserving the specified completion transition.

Unsuccessful approach: The attempted repair uses `d['last_query']`, which still violates a normal or boundary completion fixture.

Case contract

Reopening this editable picker starts from its committed label, keeps identity until text actually diverges, selects the whole label for replacement, and preserves explicit unresolved drafts on reopen. An accepted label is a baseline, not an automatic new search. Choosing edit mode invalidates old result context.

Why this case matters

Autocomplete couples draft text, suggestion identity and asynchronous presentation; this bounded lifecycle model isolates one observable interaction defect.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(event, d):
    if event == 'initial-draft': return d['label']
    if event == 'unresolved-draft': return d['draft'] if d['unresolved'] else d['label']
    if event == 'selection': return [0,len(d['label'])]
    if event == 'identity': return d['value']
    if event == 'diverged': return d['value'] if d['new_text']==d['label'] else None
    if event == 'baseline': return d['prior_label']
    if event == 'accepted-search': return not d['accepted']
    if event == 'selection-baseline': return {'baseline_id':d['value'],'baseline_text':d['label']}
    if event == 'accepted-baseline': return not d['unresolved'] and d['draft']==d['label']
    if event == 'cancel-edit': return {'value':d['value'],'draft':d['label']}
    return {'unchanged': True}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
normal = {'value':'p1','label':'Pear','draft':'Peach','unresolved':True,'last_query':'pe','active':'p2','epoch':N,'prior_label':'Plum','new_text':'Pear!','accepted':True}
boundary = {'value':'','label':'','draft':'','unresolved':False,'last_query':'','active':None,'epoch':N,'prior_label':'','new_text':'','accepted':False}
check('normal initial-draft', solve('initial-draft', normal), 'Pear')
check('boundary initial-draft', solve('initial-draft', boundary), '')
check('normal unresolved-draft', solve('unresolved-draft', normal), 'Peach')
check('boundary unresolved-draft', solve('unresolved-draft', boundary), '')
check('normal selection', solve('selection', normal), [0,4])
check('boundary selection', solve('selection', boundary), [0,0])
check('normal identity', solve('identity', normal), 'p1')
check('boundary identity', solve('identity', boundary), '')
check('normal diverged', solve('diverged', normal), None)
check('boundary diverged', solve('diverged', boundary), '')
check('normal baseline', solve('baseline', normal), 'Pear')
check('boundary baseline', solve('baseline', boundary), '')
check('normal accepted-search', solve('accepted-search', normal), False)
check('boundary accepted-search', solve('accepted-search', boundary), True)
check('normal selection-baseline', solve('selection-baseline', normal), {'baseline_id':'p1','baseline_text':'Pear'})
check('boundary selection-baseline', solve('selection-baseline', boundary), {'baseline_id':'','baseline_text':''})
check('normal accepted-baseline', solve('accepted-baseline', normal), False)
check('boundary accepted-baseline', solve('accepted-baseline', boundary), True)
check('normal cancel-edit', solve('cancel-edit', normal), {'value':'p1','draft':'Pear'})
check('boundary cancel-edit', solve('cancel-edit', boundary), {'value':'','draft':''})
variant = dict(normal, **{'label':'L'*N})
check('variant query or selection payload', solve('initial-draft', variant), 'L'*N)
check('unknown completion event', solve('unrecognized', normal), {'unchanged': True})
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
normal initial-draft	`Pear`	`Pear`	Passed
boundary initial-draft			Passed
normal unresolved-draft	`Peach`	`Peach`	Passed
boundary unresolved-draft			Passed
normal selection	`[0, 4]`	`[0, 4]`	Passed
boundary selection	`[0, 0]`	`[0, 0]`	Passed
normal identity	`p1`	`p1`	Passed
boundary identity			Passed
normal diverged	`None`	`None`	Passed
boundary diverged			Passed
normal baseline	`Plum`	`Pear`	Failed
boundary baseline			Passed
normal accepted-search	`False`	`False`	Passed
boundary accepted-search	`True`	`True`	Passed
normal selection-baseline	`{'baseline_id': 'p1', 'baseline_text': 'Pear'}`	`{'baseline_id': 'p1', 'baseline_text': 'Pear'}`	Passed
boundary selection-baseline	`{'baseline_id': '', 'baseline_text': ''}`	`{'baseline_id': '', 'baseline_text': ''}`	Passed
normal accepted-baseline	`False`	`False`	Passed
boundary accepted-baseline	`True`	`True`	Passed
normal cancel-edit	`{'draft': 'Pear', 'value': 'p1'}`	`{'draft': 'Pear', 'value': 'p1'}`	Passed
boundary cancel-edit	`{'draft': '', 'value': ''}`	`{'draft': '', 'value': ''}`	Passed
variant query or selection payload	`L`	`L`	Passed
unknown completion event	`{'unchanged': True}`	`{'unchanged': True}`	Passed

SHA-256 / ddde657a66d5a752da853db501b05356f5b9cd6ca9f82542d57074561dea850c

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(event, d):
    if event == 'initial-draft': return d['label']
    if event == 'unresolved-draft': return d['draft'] if d['unresolved'] else d['label']
    if event == 'selection': return [0,len(d['label'])]
    if event == 'identity': return d['value']
    if event == 'diverged': return d['value'] if d['new_text']==d['label'] else None
    if event == 'baseline': return d['last_query']
    if event == 'accepted-search': return not d['accepted']
    if event == 'selection-baseline': return {'baseline_id':d['value'],'baseline_text':d['label']}
    if event == 'accepted-baseline': return not d['unresolved'] and d['draft']==d['label']
    if event == 'cancel-edit': return {'value':d['value'],'draft':d['label']}
    return {'unchanged': True}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
normal = {'value':'p1','label':'Pear','draft':'Peach','unresolved':True,'last_query':'pe','active':'p2','epoch':N,'prior_label':'Plum','new_text':'Pear!','accepted':True}
boundary = {'value':'','label':'','draft':'','unresolved':False,'last_query':'','active':None,'epoch':N,'prior_label':'','new_text':'','accepted':False}
check('normal initial-draft', solve('initial-draft', normal), 'Pear')
check('boundary initial-draft', solve('initial-draft', boundary), '')
check('normal unresolved-draft', solve('unresolved-draft', normal), 'Peach')
check('boundary unresolved-draft', solve('unresolved-draft', boundary), '')
check('normal selection', solve('selection', normal), [0,4])
check('boundary selection', solve('selection', boundary), [0,0])
check('normal identity', solve('identity', normal), 'p1')
check('boundary identity', solve('identity', boundary), '')
check('normal diverged', solve('diverged', normal), None)
check('boundary diverged', solve('diverged', boundary), '')
check('normal baseline', solve('baseline', normal), 'Pear')
check('boundary baseline', solve('baseline', boundary), '')
check('normal accepted-search', solve('accepted-search', normal), False)
check('boundary accepted-search', solve('accepted-search', boundary), True)
check('normal selection-baseline', solve('selection-baseline', normal), {'baseline_id':'p1','baseline_text':'Pear'})
check('boundary selection-baseline', solve('selection-baseline', boundary), {'baseline_id':'','baseline_text':''})
check('normal accepted-baseline', solve('accepted-baseline', normal), False)
check('boundary accepted-baseline', solve('accepted-baseline', boundary), True)
check('normal cancel-edit', solve('cancel-edit', normal), {'value':'p1','draft':'Pear'})
check('boundary cancel-edit', solve('cancel-edit', boundary), {'value':'','draft':''})
variant = dict(normal, **{'label':'L'*N})
check('variant query or selection payload', solve('initial-draft', variant), 'L'*N)
check('unknown completion event', solve('unrecognized', normal), {'unchanged': True})
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
normal initial-draft	`Pear`	`Pear`	Passed
boundary initial-draft			Passed
normal unresolved-draft	`Peach`	`Peach`	Passed
boundary unresolved-draft			Passed
normal selection	`[0, 4]`	`[0, 4]`	Passed
boundary selection	`[0, 0]`	`[0, 0]`	Passed
normal identity	`p1`	`p1`	Passed
boundary identity			Passed
normal diverged	`None`	`None`	Passed
boundary diverged			Passed
normal baseline	`pe`	`Pear`	Failed
boundary baseline			Passed
normal accepted-search	`False`	`False`	Passed
boundary accepted-search	`True`	`True`	Passed
normal selection-baseline	`{'baseline_id': 'p1', 'baseline_text': 'Pear'}`	`{'baseline_id': 'p1', 'baseline_text': 'Pear'}`	Passed
boundary selection-baseline	`{'baseline_id': '', 'baseline_text': ''}`	`{'baseline_id': '', 'baseline_text': ''}`	Passed
normal accepted-baseline	`False`	`False`	Passed
boundary accepted-baseline	`True`	`True`	Passed
normal cancel-edit	`{'draft': 'Pear', 'value': 'p1'}`	`{'draft': 'Pear', 'value': 'p1'}`	Passed
boundary cancel-edit	`{'draft': '', 'value': ''}`	`{'draft': '', 'value': ''}`	Passed
variant query or selection payload	`L`	`L`	Passed
unknown completion event	`{'unchanged': True}`	`{'unchanged': True}`	Passed

SHA-256 / c887cf000b559ed31c35f74abd439f7cae5f573fad4428c67e29550a8c4df66a

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 22 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

Stipulated deterministic widget transition model; inputs are validated snapshots. It does not model browser event dispatch, network transport, or linguistic standards. 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 2026-09-29T14:40:46.707763+00:00.

Case digest / 44c41207ddb72a658916efed1473ea1157411662d9b3473051b6a3cb0676dad5