FA-37451 / Table interactions / Open access

Table expandable detail rows: detail eligibility · case 01

The table detail eligibility result violates the stipulated table expandable detail rows contract.

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

ROOT CAUSE

The detail eligibility decision uses 'key not in expanded' instead of 'key not in expanded or key not in can_expand'.

VERIFIED REPAIR

Apply the complete detail eligibility rule: key not in expanded or key not in can_expand.

Unsuccessful approach: The attempted repair 'key not in can_expand' still loses a required part of the table contract.

Case contract

Detail rows have namespaced stable render keys, follow their visible expandable owner, never count as selectable data rows, use measured heights including zero, and contribute to total content height while expansion state output excludes hidden or ineligible rows.

Why this case matters

An offline table UI model isolates table expandable detail rows, including adversarial row/column relationships.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(rows, expanded, hidden, can_expand, heights, default_height):
    out=[]
    for row in rows:
        key=row['id']
        if key in hidden: continue
        out.append({'key':('data',key),'kind':'data','owner':key,'height':row['height'],'selectable':True})
        if key not in expanded: continue
        out.append({'key':('detail',key),'kind':'detail','owner':key,'height':heights.get(key,default_height),'selectable':False})
    return {'items':out,'total':sum(x['height'] for x in out),'data_count':sum(x['kind']=='data' for x in out),'expanded': [r['id'] for r in rows if r['id'] in expanded and r['id'] in can_expand and r['id'] not in hidden]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':1+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 6, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 13, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 2:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':2+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 7, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 14, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 3:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':3+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 8, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 15, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 4:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':4+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 9, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 16, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 5:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':5+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 10, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 17, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

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
expanded detail	`{'data_count': 2, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 6, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 13}`	`{'data_count': 2, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 6, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 13}`	Passed
zero measured detail	`{'data_count': 1, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 0, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 3}`	`{'data_count': 1, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 0, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 3}`	Passed
nonexpandable row	`{'data_count': 1, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 9, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 12}`	`{'data_count': 1, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}], 'total': 3}`	Failed
hidden expanded owners	`{'data_count': 1, 'expanded': [], 'items': [{'height': 5, 'key': ['data', 'c'], 'kind': 'data', 'owner': 'c', 'selectable': True}], 'total': 5}`	`{'data_count': 1, 'expanded': [], 'items': [{'height': 5, 'key': ['data', 'c'], 'kind': 'data', 'owner': 'c', 'selectable': True}], 'total': 5}`	Passed
collapsed rows	`{'data_count': 2, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 7}`	`{'data_count': 2, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 7}`	Passed
empty	`{'data_count': 0, 'expanded': [], 'items': [], 'total': 0}`	`{'data_count': 0, 'expanded': [], 'items': [], 'total': 0}`	Passed

SHA-256 / f68f94a015889ffbf34f31984927bbfca081ceffb4a53c61f1b402c848f340a2

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(rows, expanded, hidden, can_expand, heights, default_height):
    out=[]
    for row in rows:
        key=row['id']
        if key in hidden: continue
        out.append({'key':('data',key),'kind':'data','owner':key,'height':row['height'],'selectable':True})
        if key not in can_expand: continue
        out.append({'key':('detail',key),'kind':'detail','owner':key,'height':heights.get(key,default_height),'selectable':False})
    return {'items':out,'total':sum(x['height'] for x in out),'data_count':sum(x['kind']=='data' for x in out),'expanded': [r['id'] for r in rows if r['id'] in expanded and r['id'] in can_expand and r['id'] not in hidden]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':1+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 6, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 13, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 2:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':2+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 7, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 14, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 3:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':3+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 8, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 15, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 4:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':4+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 9, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 16, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 5:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':5+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 10, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 17, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

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
expanded detail	`{'data_count': 2, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 6, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}, {'height': 9, 'key': ['detail', 'b'], 'kind': 'detail', 'owner': 'b', 'selectable': False}], 'total': 22}`	`{'data_count': 2, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 6, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 13}`	Failed
zero measured detail	`{'data_count': 1, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 0, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 3}`	`{'data_count': 1, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 0, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 3}`	Passed
nonexpandable row	`{'data_count': 1, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}], 'total': 3}`	`{'data_count': 1, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}], 'total': 3}`	Passed
hidden expanded owners	`{'data_count': 1, 'expanded': [], 'items': [{'height': 5, 'key': ['data', 'c'], 'kind': 'data', 'owner': 'c', 'selectable': True}, {'height': 9, 'key': ['detail', 'c'], 'kind': 'detail', 'owner': 'c', 'selectable': False}], 'total': 14}`	`{'data_count': 1, 'expanded': [], 'items': [{'height': 5, 'key': ['data', 'c'], 'kind': 'data', 'owner': 'c', 'selectable': True}], 'total': 5}`	Failed
collapsed rows	`{'data_count': 2, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 9, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}, {'height': 9, 'key': ['detail', 'b'], 'kind': 'detail', 'owner': 'b', 'selectable': False}], 'total': 25}`	`{'data_count': 2, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 7}`	Failed
empty	`{'data_count': 0, 'expanded': [], 'items': [], 'total': 0}`	`{'data_count': 0, 'expanded': [], 'items': [], 'total': 0}`	Passed

SHA-256 / bfadab2d38acd5c3ce82273220a540777d743a8ca071d07a963249d2cea638fa

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(rows, expanded, hidden, can_expand, heights, default_height):
    out=[]
    for row in rows:
        key=row['id']
        if key in hidden: continue
        out.append({'key':('data',key),'kind':'data','owner':key,'height':row['height'],'selectable':True})
        if key not in expanded or key not in can_expand: continue
        out.append({'key':('detail',key),'kind':'detail','owner':key,'height':heights.get(key,default_height),'selectable':False})
    return {'items':out,'total':sum(x['height'] for x in out),'data_count':sum(x['kind']=='data' for x in out),'expanded': [r['id'] for r in rows if r['id'] in expanded and r['id'] in can_expand and r['id'] not in hidden]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':1+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 6, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 13, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 2:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':2+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 7, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 14, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 3:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':3+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 8, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 15, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 4:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':4+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 9, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 16, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

if N == 5:
    check('expanded detail', solve([{'id':'a','height':3},{'id':'b','height':4}], ['a'], [], ['a','b'], {'a':5+5}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 10, 'selectable': False}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 17, 'data_count': 2, 'expanded': ['a']})
    check('zero measured detail', solve([{'id':'a','height':3}], ['a'], [], ['a'], {'a':0}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('detail', 'a'), 'kind': 'detail', 'owner': 'a', 'height': 0, 'selectable': False}], 'total': 3, 'data_count': 1, 'expanded': ['a']})
    check('nonexpandable row', solve([{'id':'a','height':3}], ['a'], [], [], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}], 'total': 3, 'data_count': 1, 'expanded': []})
    check('hidden expanded owners', solve([{'id':'a','height':3},{'id':'b','height':4},{'id':'c','height':5}], ['a','b'], ['a','b'], ['a','b','c'], {}, 9), {'items': [{'key': ('data', 'c'), 'kind': 'data', 'owner': 'c', 'height': 5, 'selectable': True}], 'total': 5, 'data_count': 1, 'expanded': []})
    check('collapsed rows', solve([{'id':'a','height':3},{'id':'b','height':4}], [], [], ['a','b'], {}, 9), {'items': [{'key': ('data', 'a'), 'kind': 'data', 'owner': 'a', 'height': 3, 'selectable': True}, {'key': ('data', 'b'), 'kind': 'data', 'owner': 'b', 'height': 4, 'selectable': True}], 'total': 7, 'data_count': 2, 'expanded': []})
    check('empty', solve([], ['missing'], [], [], {}, 9), {'items': [], 'total': 0, 'data_count': 0, 'expanded': []})

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
expanded detail	`{'data_count': 2, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 6, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 13}`	`{'data_count': 2, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 6, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 13}`	Passed
zero measured detail	`{'data_count': 1, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 0, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 3}`	`{'data_count': 1, 'expanded': ['a'], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 0, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 3}`	Passed
nonexpandable row	`{'data_count': 1, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}], 'total': 3}`	`{'data_count': 1, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}], 'total': 3}`	Passed
hidden expanded owners	`{'data_count': 1, 'expanded': [], 'items': [{'height': 5, 'key': ['data', 'c'], 'kind': 'data', 'owner': 'c', 'selectable': True}], 'total': 5}`	`{'data_count': 1, 'expanded': [], 'items': [{'height': 5, 'key': ['data', 'c'], 'kind': 'data', 'owner': 'c', 'selectable': True}], 'total': 5}`	Passed
collapsed rows	`{'data_count': 2, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 7}`	`{'data_count': 2, 'expanded': [], 'items': [{'height': 3, 'key': ['data', 'a'], 'kind': 'data', 'owner': 'a', 'selectable': True}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 7}`	Passed
empty	`{'data_count': 0, 'expanded': [], 'items': [], 'total': 0}`	`{'data_count': 0, 'expanded': [], 'items': [], 'total': 0}`	Passed

SHA-256 / ed4d33fa6741af701d1c722b1ba240aa4ee739df6368b7e1eb9582561240bbc9

Verification & scope

Base row IDs are unique; base/detail heights are nonnegative, including valid measured zero. Deterministic offline table UI model; no browser, DOM, framework, or standards conformance is claimed. 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 2026-09-29T14:43:01.301170+00:00.

Case digest / 4d24fea73675daca587d3077a56437e849fcf34a58d4add2f7a79c99f6fef387