FA-36161 / Tab interfaces / Open access

Drag cancel rollback: cancel insertion rank · case 01

The tab workspace reports an incorrect cancel insertion rank.

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

ROOT CAUSE

The cancel insertion rank decision uses None instead of x['rank'] if x['cancel'] else None.

THE FAILURE

The cancel insertion rank decision uses None instead of x['rank'] if x['cancel'] else None.

Unsuccessful approach: The partial repair 0 if x['cancel'] else None still violates a workspace boundary or normal case.

Case contract

Canceling a tab drag restores source pane and rank, removes provisional destination placeholder, restores prior selection, releases capture and discards detach preview.

Why this case matters

Offline tab/panel workspace behavior; no browser or desktop framework is emulated.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(x):
    r0 = x['original'] if x['cancel'] else x['provisional']
    r1 = x['source'] if x['cancel'] else x['destination']
    r2 = None
    r3 = x['cancel']
    r4 = x['previous_active'] if x['cancel'] else x['dragged']
    r5 = 'discard' if x['cancel'] else 'commit'
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c'], 'provisional': ['b', 'c'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'b'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'p', 2, True, 'a', 'discard'])], 2: [({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['b', 'c', 'extra0'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'b', 'extra0'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 2, True, 'a', 'discard'])], 3: [({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0', 'extra1'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['b', 'c', 'extra0', 'extra1'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'b', 'extra0', 'extra1'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 2, True, 'a', 'discard'])], 4: [({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0', 'extra1', 'extra2'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['b', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'b', 'extra0', 'extra1', 'extra2'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 2, True, 'a', 'discard'])], 5: [({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'b', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 2, True, 'a', 'discard'])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
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
workspace regression 0	`[['a', 'b', 'c'], 'p', None, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'p', 1, True, 'a', 'discard']`	Failed
workspace regression 1	`[['a', 'c'], 'q', None, False, 'b', 'commit']`	`[['a', 'c'], 'q', None, False, 'b', 'commit']`	Passed
workspace regression 2	`[['a', 'b', 'c'], 'p', None, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']`	Failed
workspace regression 3	`[['a', 'b', 'c'], 'p', None, True, 'b', 'discard']`	`[['a', 'b', 'c'], 'p', 1, True, 'b', 'discard']`	Failed
workspace regression 4	`[['a', 'b', 'c'], 'q', None, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'q', 1, True, 'a', 'discard']`	Failed
workspace regression 5	`[['a', 'b', 'c'], 'p', None, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'p', 2, True, 'a', 'discard']`	Failed

SHA-256 / f80010ad8a32d1414e64eb54d5ae4d4523474a98898de39d530cc85c531fcfb3

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(x):
    r0 = x['original'] if x['cancel'] else x['provisional']
    r1 = x['source'] if x['cancel'] else x['destination']
    r2 = 0 if x['cancel'] else None
    r3 = x['cancel']
    r4 = x['previous_active'] if x['cancel'] else x['dragged']
    r5 = 'discard' if x['cancel'] else 'commit'
    return [r0,r1,r2,r3,r4,r5]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c'], 'provisional': ['b', 'c'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'c'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c'], 'provisional': ['a', 'b'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c'], 'p', 2, True, 'a', 'discard'])], 2: [({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['b', 'c', 'extra0'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'c', 'extra0'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0'], 'provisional': ['a', 'b', 'extra0'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0'], 'p', 2, True, 'a', 'discard'])], 3: [({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0', 'extra1'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['b', 'c', 'extra0', 'extra1'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'c', 'extra0', 'extra1'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1'], 'provisional': ['a', 'b', 'extra0', 'extra1'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1'], 'p', 2, True, 'a', 'discard'])], 4: [({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0', 'extra1', 'extra2'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['b', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'provisional': ['a', 'b', 'extra0', 'extra1', 'extra2'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2'], 'p', 2, True, 'a', 'discard'])], 5: [({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': False}, [['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'q', None, False, 'b', 'commit']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'a', 'rank': 0, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 0, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'p', 'destination': 'q', 'previous_active': 'b', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 1, True, 'b', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'b', 'rank': 1, 'source': 'q', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'q', 1, True, 'a', 'discard']), ({'original': ['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'provisional': ['a', 'b', 'extra0', 'extra1', 'extra2', 'extra3'], 'dragged': 'c', 'rank': 2, 'source': 'p', 'destination': 'q', 'previous_active': 'a', 'cancel': True}, [['a', 'b', 'c', 'extra0', 'extra1', 'extra2', 'extra3'], 'p', 2, True, 'a', 'discard'])]}
for i, (inputs, expected) in enumerate(fixtures[N]):
    check("workspace regression "+str(i), solve(inputs), expected)
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
workspace regression 0	`[['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'p', 1, True, 'a', 'discard']`	Failed
workspace regression 1	`[['a', 'c'], 'q', None, False, 'b', 'commit']`	`[['a', 'c'], 'q', None, False, 'b', 'commit']`	Passed
workspace regression 2	`[['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']`	Passed
workspace regression 3	`[['a', 'b', 'c'], 'p', 0, True, 'b', 'discard']`	`[['a', 'b', 'c'], 'p', 1, True, 'b', 'discard']`	Failed
workspace regression 4	`[['a', 'b', 'c'], 'q', 0, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'q', 1, True, 'a', 'discard']`	Failed
workspace regression 5	`[['a', 'b', 'c'], 'p', 0, True, 'a', 'discard']`	`[['a', 'b', 'c'], 'p', 2, True, 'a', 'discard']`	Failed

SHA-256 / 5b901f535836203ef2ca378cd0faf1da976fc9bef8e63e5bed7481a362ec6d20

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.

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Verification & scope

Finite stipulated workspace snapshots only. Independent result fields describe observable obligations, not a full UI runtime. 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 2026-09-29T14:42:48.695651+00:00.

Case digest / 98b089395abf9aaa815ed236ed38713f0bf5ae7dee6ab6582a34be78d8864e4e