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FA-37991 / Table interactions / Open access

Table column resize transaction: resize base snapshot · case 01

The table resize base snapshot result violates the stipulated table column resize transaction contract.

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

ROOT CAUSE

The resize base snapshot decision uses "'base':state.get('base',0)" instead of "'base':widths[state['column']]".

THE FAILURE

The resize base snapshot decision uses "'base':state.get('base',0)" instead of "'base':widths[state['column']]".

Unsuccessful approach: The attempted repair "'base':state.get('draft',widths[state['column']])" still loses a required part of the table contract.

Case contract

A table resize snapshots its starting width and pointer, applies cumulative drag displacement from that snapshot with RTL inversion and bounds, supports live/deferred drawing, rolls back cancel, commits the final pointer displacement, and persists only changed widths.

Why this case matters

An offline table UI model isolates table column resize transaction, 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(state, event, pointer, delta, widths, constraints, rtl, live):
    out=dict(state); current=dict(widths)
    if event=='start':
        out={'pointer':pointer,'column':state['column'],'base':state.get('base',0),'draft':widths[state['column']]}
        return {'state':out,'widths':current,'persist':None}
    if state.get('pointer')!=pointer: return {'state':out,'widths':current,'persist':None}
    c=state['column']; low,high=constraints[c]
    proposed=max(low,min(high,state['base']+(-delta if rtl else delta)))
    if event=='move':
        out['draft']=proposed
        if live: current[c]=proposed
        return {'state':out,'widths':current,'persist':None}
    if event=='cancel':
        current[c]=state['base']; return {'state':{},'widths':current,'persist':None}
    if event=='end':
        current[c]=proposed
        return {'state':{},'widths':current,'persist':(c,proposed) if proposed!=state['base'] else None}
    return {'state':out,'widths':current,'persist':None}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*1,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 2:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*2,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 20, 'draft': 20}, 'widths': {'a': 20, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 3:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*3,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 30, 'draft': 30}, 'widths': {'a': 30, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 4:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*4,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 40, 'draft': 40}, 'widths': {'a': 40, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 5:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*5,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 50, 'draft': 50}, 'widths': {'a': 50, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

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
fresh drag snapshot{'persist': None, 'state': {'base': 1, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10, 'b': 9}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10, 'b': 9}}Failed
live move absolute delta{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 15, 'pointer': 7}, 'widths': {'a': 15, 'b': 9}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 15, 'pointer': 7}, 'widths': {'a': 15, 'b': 9}}Passed
deferred rtl move{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 5, 'pointer': 7}, 'widths': {'a': 10}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 5, 'pointer': 7}, 'widths': {'a': 10}}Passed
other pointer{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10}}Passed
cancel live{'persist': None, 'state': {}, 'widths': {'a': 10}}{'persist': None, 'state': {}, 'widths': {'a': 10}}Passed
end latest delta{'persist': ['a', 50], 'state': {}, 'widths': {'a': 50}}{'persist': ['a', 50], 'state': {}, 'widths': {'a': 50}}Passed
end shrink{'persist': ['a', 8], 'state': {}, 'widths': {'a': 8}}{'persist': ['a', 8], 'state': {}, 'widths': {'a': 8}}Passed
noop end{'persist': None, 'state': {}, 'widths': {'a': 10}}{'persist': None, 'state': {}, 'widths': {'a': 10}}Passed

SHA-256 / b3bf809b5f0c4fcc072a8e720c72d48b2628e046c87c3ecbb48f9f0827f5ea95

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(state, event, pointer, delta, widths, constraints, rtl, live):
    out=dict(state); current=dict(widths)
    if event=='start':
        out={'pointer':pointer,'column':state['column'],'base':state.get('draft',widths[state['column']]),'draft':widths[state['column']]}
        return {'state':out,'widths':current,'persist':None}
    if state.get('pointer')!=pointer: return {'state':out,'widths':current,'persist':None}
    c=state['column']; low,high=constraints[c]
    proposed=max(low,min(high,state['base']+(-delta if rtl else delta)))
    if event=='move':
        out['draft']=proposed
        if live: current[c]=proposed
        return {'state':out,'widths':current,'persist':None}
    if event=='cancel':
        current[c]=state['base']; return {'state':{},'widths':current,'persist':None}
    if event=='end':
        current[c]=proposed
        return {'state':{},'widths':current,'persist':(c,proposed) if proposed!=state['base'] else None}
    return {'state':out,'widths':current,'persist':None}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*1,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 2:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*2,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 20, 'draft': 20}, 'widths': {'a': 20, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 3:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*3,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 30, 'draft': 30}, 'widths': {'a': 30, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 4:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*4,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 40, 'draft': 40}, 'widths': {'a': 40, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

if N == 5:
    check('fresh drag snapshot', solve({'column':'a','base':1,'draft':2}, 'start', 7, 0, {'a':10*5,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 50, 'draft': 50}, 'widths': {'a': 50, 'b': 9}, 'persist': None})
    check('live move absolute delta', solve({'pointer':7,'column':'a','base':10,'draft':13}, 'move', 7, 5, {'a':13,'b':9}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 15}, 'widths': {'a': 15, 'b': 9}, 'persist': None})
    check('deferred rtl move', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'move', 7, 20, {'a':10}, {'a':(5,50)}, True, False), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 5}, 'widths': {'a': 10}, 'persist': None})
    check('other pointer', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 8, 20, {'a':10}, {'a':(5,50)}, False, True), {'state': {'pointer': 7, 'column': 'a', 'base': 10, 'draft': 10}, 'widths': {'a': 10}, 'persist': None})
    check('cancel live', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'cancel', 7, 5, {'a':15}, {'a':(5,50)}, False, True), {'state': {}, 'widths': {'a': 10}, 'persist': None})
    check('end latest delta', solve({'pointer':7,'column':'a','base':10,'draft':15}, 'end', 7, 70, {'a':15}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 50}, 'persist': ('a', 50)})
    check('end shrink', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, -2, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 8}, 'persist': ('a', 8)})
    check('noop end', solve({'pointer':7,'column':'a','base':10,'draft':10}, 'end', 7, 0, {'a':10}, {'a':(5,50)}, False, False), {'state': {}, 'widths': {'a': 10}, 'persist': None})

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
fresh drag snapshot{'persist': None, 'state': {'base': 2, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10, 'b': 9}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10, 'b': 9}}Failed
live move absolute delta{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 15, 'pointer': 7}, 'widths': {'a': 15, 'b': 9}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 15, 'pointer': 7}, 'widths': {'a': 15, 'b': 9}}Passed
deferred rtl move{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 5, 'pointer': 7}, 'widths': {'a': 10}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 5, 'pointer': 7}, 'widths': {'a': 10}}Passed
other pointer{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10}}{'persist': None, 'state': {'base': 10, 'column': 'a', 'draft': 10, 'pointer': 7}, 'widths': {'a': 10}}Passed
cancel live{'persist': None, 'state': {}, 'widths': {'a': 10}}{'persist': None, 'state': {}, 'widths': {'a': 10}}Passed
end latest delta{'persist': ['a', 50], 'state': {}, 'widths': {'a': 50}}{'persist': ['a', 50], 'state': {}, 'widths': {'a': 50}}Passed
end shrink{'persist': ['a', 8], 'state': {}, 'widths': {'a': 8}}{'persist': ['a', 8], 'state': {}, 'widths': {'a': 8}}Passed
noop end{'persist': None, 'state': {}, 'widths': {'a': 10}}{'persist': None, 'state': {}, 'widths': {'a': 10}}Passed

SHA-256 / 11cd4052b7c647d66262f64843e4cdc2b85ad2c93b09c8633346e8354c4070ec

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.

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Verification & scope

Resize bounds are ordered and the column exists; nonstart events carry a well-formed captured drag snapshot. 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 2026-09-29T14:43:07.167956+00:00.

Case digest / 5964268c63100edc865c22c453b63b20bd148038c70d31b97e2ff5a12661ca8d