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FA-36921 / Table interactions / Open access

Pinned table panes: center scroll · case 01

The table center scroll result violates the stipulated pinned table panes contract.

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

ROOT CAUSE

The center scroll decision uses ' + scroll' instead of ' - scroll'.

THE FAILURE

The center scroll decision uses ' + scroll' instead of ' - scroll'.

Unsuccessful approach: The attempted repair '' still loses a required part of the table contract.

Case contract

Partition visible schema columns into left, center, and right panes; left wins conflicting pin assignments. Pin order follows schema, left offsets are prefixes, right offsets suffixes, only center moves on scroll, reservations exclude hidden tracks.

Why this case matters

An offline table UI model isolates pinned table panes, 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(ids, left, right, hidden, widths, scroll):
    visible = [c for c in ids if c not in hidden]
    l = [c for c in visible if c in left]
    r = [c for c in visible if c in right and c not in left]
    m = [c for c in visible if c not in left and c not in right]
    lo = {c: sum(widths[x] for x in l[:i]) for i,c in enumerate(l)}
    ro = {c: sum(widths[x] for x in r[i+1:]) for i,c in enumerate(r)}
    mo = {c: sum(widths[x] for x in m[:i]) + scroll for i,c in enumerate(m)}
    return [l,m,r,lo,ro,mo,sum(widths[x] for x in l),sum(widths[x] for x in r),l[-1:] if m or r else [],r[:1] if l or m else []]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*1,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 2}, {'d': 6, 'e': 0}, {'c': -3}, 5, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 2:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*2,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 4}, {'d': 6, 'e': 0}, {'c': -3}, 7, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 3:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*3,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 6}, {'d': 6, 'e': 0}, {'c': -3}, 9, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 4:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*4,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 8}, {'d': 6, 'e': 0}, {'c': -3}, 11, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 5:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*5,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 10}, {'d': 6, 'e': 0}, {'c': -3}, 13, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

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 fixtureActualExpectedOutcome
mixed panes[['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 2}, {'d': 6, 'e': 0}, {'c': 3}, 5, 10, ['b'], ['d']][['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 2}, {'d': 6, 'e': 0}, {'c': -3}, 5, 10, ['b'], ['d']]Failed
overlap priority[['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']][['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']]Passed
hidden pins[[], ['c'], [], {}, {}, {'c': 2}, 0, 0, [], []][[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []]Failed
only left[['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []][['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []]Passed
only right[[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []][[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []]Passed
empty[[], [], [], {}, {}, {}, 0, 0, [], []][[], [], [], {}, {}, {}, 0, 0, [], []]Passed

SHA-256 / 8c2aa504e263a5012d1d7fa3d93f066e421ea8390b89c1ab1dceb58e3ba16d51

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(ids, left, right, hidden, widths, scroll):
    visible = [c for c in ids if c not in hidden]
    l = [c for c in visible if c in left]
    r = [c for c in visible if c in right and c not in left]
    m = [c for c in visible if c not in left and c not in right]
    lo = {c: sum(widths[x] for x in l[:i]) for i,c in enumerate(l)}
    ro = {c: sum(widths[x] for x in r[i+1:]) for i,c in enumerate(r)}
    mo = {c: sum(widths[x] for x in m[:i]) for i,c in enumerate(m)}
    return [l,m,r,lo,ro,mo,sum(widths[x] for x in l),sum(widths[x] for x in r),l[-1:] if m or r else [],r[:1] if l or m else []]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*1,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 2}, {'d': 6, 'e': 0}, {'c': -3}, 5, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 2:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*2,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 4}, {'d': 6, 'e': 0}, {'c': -3}, 7, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 3:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*3,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 6}, {'d': 6, 'e': 0}, {'c': -3}, 9, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 4:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*4,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 8}, {'d': 6, 'e': 0}, {'c': -3}, 11, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

if N == 5:
    check('mixed panes', solve(['a','b','c','d','e'], ['b','a'], ['d','e'], [], {'a':2*5,'b':3,'c':7,'d':4,'e':6}, 3), [['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 10}, {'d': 6, 'e': 0}, {'c': -3}, 13, 10, ['b'], ['d']])
    check('overlap priority', solve(['a','b','c'], ['a','b'], ['b','c'], [], {'a':2,'b':4,'c':8}, 1), [['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']])
    check('hidden pins', solve(['a','b','c'], ['a'], ['b'], ['a','b'], {'a':2,'b':4,'c':8}, 2), [[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []])
    check('only left', solve(['a','b'], ['a','b'], [], [], {'a':2,'b':4}, 0), [['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []])
    check('only right', solve(['a','b'], [], ['a','b'], [], {'a':2,'b':4}, 0), [[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []])
    check('empty', solve([], [], [], [], {}, 0), [[], [], [], {}, {}, {}, 0, 0, [], []])

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 fixtureActualExpectedOutcome
mixed panes[['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 2}, {'d': 6, 'e': 0}, {'c': 0}, 5, 10, ['b'], ['d']][['a', 'b'], ['c'], ['d', 'e'], {'a': 0, 'b': 2}, {'d': 6, 'e': 0}, {'c': -3}, 5, 10, ['b'], ['d']]Failed
overlap priority[['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']][['a', 'b'], [], ['c'], {'a': 0, 'b': 2}, {'c': 0}, {}, 6, 8, ['b'], ['c']]Passed
hidden pins[[], ['c'], [], {}, {}, {'c': 0}, 0, 0, [], []][[], ['c'], [], {}, {}, {'c': -2}, 0, 0, [], []]Failed
only left[['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []][['a', 'b'], [], [], {'a': 0, 'b': 2}, {}, {}, 6, 0, [], []]Passed
only right[[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []][[], [], ['a', 'b'], {}, {'a': 4, 'b': 0}, {}, 0, 6, [], []]Passed
empty[[], [], [], {}, {}, {}, 0, 0, [], []][[], [], [], {}, {}, {}, 0, 0, [], []]Passed

SHA-256 / b8eaa78c943e989ffa40638670890b6a3e5093ab69b9eb3f7da2dab245436d9d

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.

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Verification & scope

Schema IDs are unique and every schema column has a nonnegative width. 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 2026-09-29T14:42:56.257501+00:00.

Case digest / 17054b4a63677651279d74ac11f3bc8bdf8c47c08874e154e04b784a333528b9