FA-38271 / Table interactions / Open access

Table cell render invalidation: wrap measure only · case 01

The table wrap measure only result violates the stipulated table cell render invalidation contract.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The wrap measure only decision uses 'changed or layout' instead of "c.get('wrap',False) and (changed or layout)".

THE FAILURE

The wrap measure only decision uses 'changed or layout' instead of "c.get('wrap',False) and (changed or layout)".

Unsuccessful approach: The attempted repair "c.get('wrap',False) and changed" still loses a required part of the table contract.

Case contract

Table invalidation uses column field accessors and stable row IDs; repaint follows value, symmetric selection, error-text, width, stripe parity, or theme changes. Only wrapped cells remeasure on value/width changes, and added/removed row IDs drive mount/disposal.

Why this case matters

An offline table UI model isolates table cell render invalidation, 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(old_rows, new_rows, columns, selected_before, selected_after, old_widths, new_widths, old_theme, new_theme, old_errors, new_errors):
    old={r['id']:r for r in old_rows}; new={r['id']:r for r in new_rows}
    old_order=[r['id'] for r in old_rows]; new_order=[r['id'] for r in new_rows]
    paint=[]; measure=[]
    for r in new_rows:
        key=r['id']
        for c in columns:
            cell=(key,c['id'])
            changed=key not in old or old[key].get(c['field'])!=r.get(c['field'])
            decor=(cell in selected_before)!=(cell in selected_after) or old_errors.get(cell)!=new_errors.get(cell)
            layout=old_widths.get(c['id'])!=new_widths.get(c['id'])
            stripe=c.get('stripe',False) and (key not in old_order or old_order.index(key)%2!=new_order.index(key)%2)
            if changed or decor or layout or stripe or old_theme!=new_theme: paint.append(cell)
            if changed or layout: measure.append(cell)
    return {'paint':paint,'measure':measure,'removed':[k for k in old_order if k not in new],'added':[k for k in new_order if k not in old]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':1+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 2:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':2+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 3:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':3+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 4:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':4+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 5:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':5+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

check('variant wrapping width invalidation', solve([{'id':'r','a':1}], [{'id':'r','a':1}], [{'id':'a','field':'a','wrap':True}], [], [], {'a':N}, {'a':3}, 'light', 'light', {}, {}), {'paint':[('r','a')] if N!=3 else [],'measure':[('r','a')] if N!=3 else [],'removed':[],'added':[]})
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
accessor value changes	`{'added': [], 'measure': [['a', 'display']], 'paint': [['a', 'display']], 'removed': []}`	`{'added': [], 'measure': [['a', 'display']], 'paint': [['a', 'display']], 'removed': []}`	Passed
selection removed and added	`{'added': [], 'measure': [], 'paint': [['a', 'v'], ['b', 'v']], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [['a', 'v'], ['b', 'v']], 'removed': []}`	Passed
error message changes	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	Passed
width shrinks wrapping	`{'added': [], 'measure': [['a', 'v']], 'paint': [['a', 'v']], 'removed': []}`	`{'added': [], 'measure': [['a', 'v']], 'paint': [['a', 'v']], 'removed': []}`	Passed
theme-only repaint	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	Passed
parity and removals	`{'added': ['new'], 'measure': [['new', 'v']], 'paint': [['b', 'v'], ['c', 'v'], ['new', 'v']], 'removed': ['gone']}`	`{'added': ['new'], 'measure': [], 'paint': [['b', 'v'], ['c', 'v'], ['new', 'v']], 'removed': ['gone']}`	Failed
unchanged	`{'added': [], 'measure': [], 'paint': [], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [], 'removed': []}`	Passed
variant wrapping width invalidation	`{'added': [], 'measure': [['r', 'a']], 'paint': [['r', 'a']], 'removed': []}`	`{'added': [], 'measure': [['r', 'a']], 'paint': [['r', 'a']], 'removed': []}`	Passed

SHA-256 / ee96afa8cc34d2c86e68c9a07bceae21aecfef0d24865c60d81bead929bbce4d

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(old_rows, new_rows, columns, selected_before, selected_after, old_widths, new_widths, old_theme, new_theme, old_errors, new_errors):
    old={r['id']:r for r in old_rows}; new={r['id']:r for r in new_rows}
    old_order=[r['id'] for r in old_rows]; new_order=[r['id'] for r in new_rows]
    paint=[]; measure=[]
    for r in new_rows:
        key=r['id']
        for c in columns:
            cell=(key,c['id'])
            changed=key not in old or old[key].get(c['field'])!=r.get(c['field'])
            decor=(cell in selected_before)!=(cell in selected_after) or old_errors.get(cell)!=new_errors.get(cell)
            layout=old_widths.get(c['id'])!=new_widths.get(c['id'])
            stripe=c.get('stripe',False) and (key not in old_order or old_order.index(key)%2!=new_order.index(key)%2)
            if changed or decor or layout or stripe or old_theme!=new_theme: paint.append(cell)
            if c.get('wrap',False) and changed: measure.append(cell)
    return {'paint':paint,'measure':measure,'removed':[k for k in old_order if k not in new],'added':[k for k in new_order if k not in old]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':1+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 2:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':2+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 3:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':3+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 4:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':4+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

if N == 5:
    check('accessor value changes', solve([{'id':'a','amount':1,'note':'same'}], [{'id':'a','amount':5+2,'note':'same'}], [{'id':'display','field':'amount','wrap':True},{'id':'note','field':'note'}], [], [], {'display':8,'note':4}, {'display':8,'note':4}, 'light', 'light', {}, {}), {'paint': [('a', 'display')], 'measure': [('a', 'display')], 'removed': [], 'added': []})
    check('selection removed and added', solve([{'id':'a','v':1},{'id':'b','v':2}], [{'id':'a','v':1},{'id':'b','v':2}], [{'id':'v','field':'v','wrap':True}], [('a','v')], [('b','v')], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('a', 'v'), ('b', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('error message changes', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {('a','v'):'old'}, {('a','v'):'new'}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('width shrinks wrapping', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':8}, {'v':4}, 'light', 'light', {}, {}), {'paint': [('a', 'v')], 'measure': [('a', 'v')], 'removed': [], 'added': []})
    check('theme-only repaint', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v','wrap':True}], [], [], {'v':5}, {'v':5}, 'light', 'dark', {}, {}), {'paint': [('a', 'v')], 'measure': [], 'removed': [], 'added': []})
    check('parity and removals', solve([{'id':'a','v':1},{'id':'b','v':2},{'id':'c','v':3},{'id':'gone','v':4}], [{'id':'b','v':2},{'id':'c','v':3},{'id':'a','v':1},{'id':'new','v':5}], [{'id':'v','field':'v','stripe':True}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [('b', 'v'), ('c', 'v'), ('new', 'v')], 'measure': [], 'removed': ['gone'], 'added': ['new']})
    check('unchanged', solve([{'id':'a','v':1}], [{'id':'a','v':1}], [{'id':'v','field':'v'}], [], [], {'v':5}, {'v':5}, 'light', 'light', {}, {}), {'paint': [], 'measure': [], 'removed': [], 'added': []})

check('variant wrapping width invalidation', solve([{'id':'r','a':1}], [{'id':'r','a':1}], [{'id':'a','field':'a','wrap':True}], [], [], {'a':N}, {'a':3}, 'light', 'light', {}, {}), {'paint':[('r','a')] if N!=3 else [],'measure':[('r','a')] if N!=3 else [],'removed':[],'added':[]})
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
accessor value changes	`{'added': [], 'measure': [['a', 'display']], 'paint': [['a', 'display']], 'removed': []}`	`{'added': [], 'measure': [['a', 'display']], 'paint': [['a', 'display']], 'removed': []}`	Passed
selection removed and added	`{'added': [], 'measure': [], 'paint': [['a', 'v'], ['b', 'v']], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [['a', 'v'], ['b', 'v']], 'removed': []}`	Passed
error message changes	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	Passed
width shrinks wrapping	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	`{'added': [], 'measure': [['a', 'v']], 'paint': [['a', 'v']], 'removed': []}`	Failed
theme-only repaint	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [['a', 'v']], 'removed': []}`	Passed
parity and removals	`{'added': ['new'], 'measure': [], 'paint': [['b', 'v'], ['c', 'v'], ['new', 'v']], 'removed': ['gone']}`	`{'added': ['new'], 'measure': [], 'paint': [['b', 'v'], ['c', 'v'], ['new', 'v']], 'removed': ['gone']}`	Passed
unchanged	`{'added': [], 'measure': [], 'paint': [], 'removed': []}`	`{'added': [], 'measure': [], 'paint': [], 'removed': []}`	Passed
variant wrapping width invalidation	`{'added': [], 'measure': [], 'paint': [['r', 'a']], 'removed': []}`	`{'added': [], 'measure': [['r', 'a']], 'paint': [['r', 'a']], 'removed': []}`	Failed

SHA-256 / 87bceebaff3185aa577cc9857c27bef612dac6b8b66641b3aebd6e2d9114ebd6

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 8 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

Source row and schema IDs are unique; accessors name direct fields and stripe invalidation uses parity only. 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 2026-09-29T14:43:09.694884+00:00.

Case digest / 5da2c37a4a7bfd837e2132a815cf9004795b3a729f180324d0175a9818eb0d9c