FA-37466 / Table interactions / Open access

Table expandable detail rows: detail height cache · case 01

The table detail height cache result violates the stipulated table expandable detail rows contract.

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

ROOT CAUSE

The detail height cache decision uses 'default_height' instead of 'heights.get(key,default_height)'.

THE FAILURE

The detail height cache decision uses 'default_height' instead of 'heights.get(key,default_height)'.

Unsuccessful approach: The attempted repair 'heights.get(key) or default_height' 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 or key not in can_expand: continue
        out.append({'key':('detail',key),'kind':'detail','owner':key,'height':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': 9, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}, {'height': 4, 'key': ['data', 'b'], 'kind': 'data', 'owner': 'b', 'selectable': True}], 'total': 16}`	`{'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': 9, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 12}`	`{'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}`	Failed
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 / faf4b6cd01eeaff8f679d4289dc007a07ef104cbe1c5ba985d02c75f7f4b7d3e

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 expanded or key not in can_expand: continue
        out.append({'key':('detail',key),'kind':'detail','owner':key,'height':heights.get(key) or 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': 9, 'key': ['detail', 'a'], 'kind': 'detail', 'owner': 'a', 'selectable': False}], 'total': 12}`	`{'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}`	Failed
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 / c4810877b99fc55274c66730be5330e42c59d330ab1788d394e3c314cc6ab9a0

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.

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 2026-09-29T14:43:01.652106+00:00.

Case digest / 1c9fc9054298da569ebd66f00e88a3d53d542d77c1f35c1e48e373a8052b1300