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FA-35401 / Tab interfaces / Open access

Preview replacement: reusable preview · case 01

The tab workspace reports an incorrect reusable preview.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The reusable preview decision uses x['preview'] is not None instead of x['preview'] is not None and not x['dirty'] and not x['pinned'].

VERIFIED REPAIR

Use the stipulated workspace rule: x['preview'] is not None and not x['dirty'] and not x['pinned'].

Unsuccessful approach: The partial repair not x['dirty'] still violates a workspace boundary or normal case.

Case contract

A preview can replace only a clean unpinned preview. Reusing the view retains its slot but replaces document state; promotion makes it durable.

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['preview'] is not None
    r1 = x['incoming']
    r2 = 0 if x['incoming']!=x['preview'] else x['scroll']
    r3 = 'durable' if x['promote'] else 'preview'
    r4 = x['dirty'] or x['pinned']
    r5 = x['slot'] if x['preview'] is not None and not x['dirty'] and not x['pinned'] else x['slot']+1
    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: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 70, 'promote': True}, [True, 'old', 70, 'durable', False, 2])], 2: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 140, 'promote': True}, [True, 'old', 140, 'durable', False, 2])], 3: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 210, 'promote': True}, [True, 'old', 210, 'durable', False, 2])], 4: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 280, 'promote': True}, [True, 'old', 280, 'durable', False, 2])], 5: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 350, 'promote': True}, [True, 'old', 350, 'durable', False, 2])]}
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 fixtureActualExpectedOutcome
workspace regression 0[True, 'new', 0, 'durable', False, 2][True, 'new', 0, 'durable', False, 2]Passed
workspace regression 1[True, 'new', 0, 'durable', True, 3][False, 'new', 0, 'durable', True, 3]Failed
workspace regression 2[True, 'new', 0, 'durable', True, 3][False, 'new', 0, 'durable', True, 3]Failed
workspace regression 3[True, 'new', 0, 'preview', False, 2][True, 'new', 0, 'preview', False, 2]Passed
workspace regression 4[False, 'new', 0, 'durable', False, 3][False, 'new', 0, 'durable', False, 3]Passed
workspace regression 5[True, 'old', 0, 'durable', False, 2][True, 'old', 0, 'durable', False, 2]Passed
workspace regression 6[True, 'old', 70, 'durable', False, 2][True, 'old', 70, 'durable', False, 2]Passed

SHA-256 / 0eb712690a3dd282de215f8ac970209dc8298e0d43b4687d2f26ccfb31522b46

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(x):
    r0 = not x['dirty']
    r1 = x['incoming']
    r2 = 0 if x['incoming']!=x['preview'] else x['scroll']
    r3 = 'durable' if x['promote'] else 'preview'
    r4 = x['dirty'] or x['pinned']
    r5 = x['slot'] if x['preview'] is not None and not x['dirty'] and not x['pinned'] else x['slot']+1
    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: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 70, 'promote': True}, [True, 'old', 70, 'durable', False, 2])], 2: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 140, 'promote': True}, [True, 'old', 140, 'durable', False, 2])], 3: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 210, 'promote': True}, [True, 'old', 210, 'durable', False, 2])], 4: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 280, 'promote': True}, [True, 'old', 280, 'durable', False, 2])], 5: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 350, 'promote': True}, [True, 'old', 350, 'durable', False, 2])]}
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 fixtureActualExpectedOutcome
workspace regression 0[True, 'new', 0, 'durable', False, 2][True, 'new', 0, 'durable', False, 2]Passed
workspace regression 1[False, 'new', 0, 'durable', True, 3][False, 'new', 0, 'durable', True, 3]Passed
workspace regression 2[True, 'new', 0, 'durable', True, 3][False, 'new', 0, 'durable', True, 3]Failed
workspace regression 3[True, 'new', 0, 'preview', False, 2][True, 'new', 0, 'preview', False, 2]Passed
workspace regression 4[True, 'new', 0, 'durable', False, 3][False, 'new', 0, 'durable', False, 3]Failed
workspace regression 5[True, 'old', 0, 'durable', False, 2][True, 'old', 0, 'durable', False, 2]Passed
workspace regression 6[True, 'old', 70, 'durable', False, 2][True, 'old', 70, 'durable', False, 2]Passed

SHA-256 / 5d286fe5860bdad4d1f5c83acb14482fd8ee2fe583a5ef0ed349a86ee518b393

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    r0 = x['preview'] is not None and not x['dirty'] and not x['pinned']
    r1 = x['incoming']
    r2 = 0 if x['incoming']!=x['preview'] else x['scroll']
    r3 = 'durable' if x['promote'] else 'preview'
    r4 = x['dirty'] or x['pinned']
    r5 = x['slot'] if x['preview'] is not None and not x['dirty'] and not x['pinned'] else x['slot']+1
    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: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 70, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 70, 'promote': True}, [True, 'old', 70, 'durable', False, 2])], 2: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 140, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 140, 'promote': True}, [True, 'old', 140, 'durable', False, 2])], 3: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 210, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 210, 'promote': True}, [True, 'old', 210, 'durable', False, 2])], 4: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 280, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 280, 'promote': True}, [True, 'old', 280, 'durable', False, 2])], 5: [({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [True, 'new', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': True, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': True, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', True, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': False}, [True, 'new', 0, 'preview', False, 2]), ({'preview': None, 'dirty': False, 'pinned': False, 'incoming': 'new', 'slot': 2, 'scroll': 350, 'promote': True}, [False, 'new', 0, 'durable', False, 3]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 0, 'promote': True}, [True, 'old', 0, 'durable', False, 2]), ({'preview': 'old', 'dirty': False, 'pinned': False, 'incoming': 'old', 'slot': 2, 'scroll': 350, 'promote': True}, [True, 'old', 350, 'durable', False, 2])]}
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 fixtureActualExpectedOutcome
workspace regression 0[True, 'new', 0, 'durable', False, 2][True, 'new', 0, 'durable', False, 2]Passed
workspace regression 1[False, 'new', 0, 'durable', True, 3][False, 'new', 0, 'durable', True, 3]Passed
workspace regression 2[False, 'new', 0, 'durable', True, 3][False, 'new', 0, 'durable', True, 3]Passed
workspace regression 3[True, 'new', 0, 'preview', False, 2][True, 'new', 0, 'preview', False, 2]Passed
workspace regression 4[False, 'new', 0, 'durable', False, 3][False, 'new', 0, 'durable', False, 3]Passed
workspace regression 5[True, 'old', 0, 'durable', False, 2][True, 'old', 0, 'durable', False, 2]Passed
workspace regression 6[True, 'old', 70, 'durable', False, 2][True, 'old', 70, 'durable', False, 2]Passed

SHA-256 / da7d7647238b93f0a1c0ac9880588b9fb8ee58f5010265e9982ca9f1360e88ce

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 2026-09-29T14:42:41.224974+00:00.

Case digest / 80db3c2cac4b595c82e603ccca1d772ecb469f20414ddf17a11fbeda03092feb