FAILURE MAP
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FA-35751 / Tab interfaces / Open access

Tab width budget: minimum overflow · case 01

The tab workspace reports an incorrect minimum overflow.

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

ROOT CAUSE

The minimum overflow decision uses 0 instead of max(0,x['normal']*x['min_width']+x['pins']*x['pin_width']+x['controls']-x['viewport']).

THE FAILURE

The minimum overflow decision uses 0 instead of max(0,x['normal']*x['min_width']+x['pins']*x['pin_width']+x['controls']-x['viewport']).

Unsuccessful approach: The partial repair max(0,x['normal']*x['min_width']-x['viewport']) still violates a workspace boundary or normal case.

Case contract

A strip reserves fixed control and pinned widths before distributing remaining width equally among normal tabs, clamped to min/max; report overflow and spacer.

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['viewport']-x['controls']
    r1 = x['pins']*x['pin_width']
    r2 = max(0,x['viewport']-x['controls']-x['pins']*x['pin_width'])//x['normal']
    r3 = min(x['max_width'],max(x['min_width'],(x['viewport']-x['controls']-x['pins']*x['pin_width'])//x['normal']))
    r4 = 0
    r5 = max(0,x['viewport']-x['controls']-x['pins']*x['pin_width']-x['normal']*x['max_width'])
    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: [({'viewport': 500, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [460, 60, 100, 100, 0, 0]), ({'viewport': 300, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [260, 60, 50, 80, 120, 0]), ({'viewport': 500, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 1, 'min_width': 80, 'max_width': 160}, [460, 60, 400, 160, 0, 240]), ({'viewport': 500, 'controls': 40, 'pins': 0, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [460, 0, 115, 115, 0, 0]), ({'viewport': 900, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [860, 60, 200, 160, 0, 160]), ({'viewport': 500, 'controls': 0, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [500, 60, 110, 110, 0, 0])], 2: [({'viewport': 1000, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [920, 120, 200, 200, 0, 0]), ({'viewport': 600, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [520, 120, 100, 160, 240, 0]), ({'viewport': 1000, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 1, 'min_width': 160, 'max_width': 320}, [920, 120, 800, 320, 0, 480]), ({'viewport': 1000, 'controls': 80, 'pins': 0, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [920, 0, 230, 230, 0, 0]), ({'viewport': 1800, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [1720, 120, 400, 320, 0, 320]), ({'viewport': 1000, 'controls': 0, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [1000, 120, 220, 220, 0, 0])], 3: [({'viewport': 1500, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [1380, 180, 300, 300, 0, 0]), ({'viewport': 900, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [780, 180, 150, 240, 360, 0]), ({'viewport': 1500, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 1, 'min_width': 240, 'max_width': 480}, [1380, 180, 1200, 480, 0, 720]), ({'viewport': 1500, 'controls': 120, 'pins': 0, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [1380, 0, 345, 345, 0, 0]), ({'viewport': 2700, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [2580, 180, 600, 480, 0, 480]), ({'viewport': 1500, 'controls': 0, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [1500, 180, 330, 330, 0, 0])], 4: [({'viewport': 2000, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [1840, 240, 400, 400, 0, 0]), ({'viewport': 1200, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [1040, 240, 200, 320, 480, 0]), ({'viewport': 2000, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 1, 'min_width': 320, 'max_width': 640}, [1840, 240, 1600, 640, 0, 960]), ({'viewport': 2000, 'controls': 160, 'pins': 0, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [1840, 0, 460, 460, 0, 0]), ({'viewport': 3600, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [3440, 240, 800, 640, 0, 640]), ({'viewport': 2000, 'controls': 0, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [2000, 240, 440, 440, 0, 0])], 5: [({'viewport': 2500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [2300, 300, 500, 500, 0, 0]), ({'viewport': 1500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [1300, 300, 250, 400, 600, 0]), ({'viewport': 2500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 1, 'min_width': 400, 'max_width': 800}, [2300, 300, 2000, 800, 0, 1200]), ({'viewport': 2500, 'controls': 200, 'pins': 0, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [2300, 0, 575, 575, 0, 0]), ({'viewport': 4500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [4300, 300, 1000, 800, 0, 800]), ({'viewport': 2500, 'controls': 0, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [2500, 300, 550, 550, 0, 0])]}
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[460, 60, 100, 100, 0, 0][460, 60, 100, 100, 0, 0]Passed
workspace regression 1[260, 60, 50, 80, 0, 0][260, 60, 50, 80, 120, 0]Failed
workspace regression 2[460, 60, 400, 160, 0, 240][460, 60, 400, 160, 0, 240]Passed
workspace regression 3[460, 0, 115, 115, 0, 0][460, 0, 115, 115, 0, 0]Passed
workspace regression 4[860, 60, 200, 160, 0, 160][860, 60, 200, 160, 0, 160]Passed
workspace regression 5[500, 60, 110, 110, 0, 0][500, 60, 110, 110, 0, 0]Passed

SHA-256 / ad1f3bb202753867321c125347d522c4d40385cc8a7e5259ad6db68f7fc5310f

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(x):
    r0 = x['viewport']-x['controls']
    r1 = x['pins']*x['pin_width']
    r2 = max(0,x['viewport']-x['controls']-x['pins']*x['pin_width'])//x['normal']
    r3 = min(x['max_width'],max(x['min_width'],(x['viewport']-x['controls']-x['pins']*x['pin_width'])//x['normal']))
    r4 = max(0,x['normal']*x['min_width']-x['viewport'])
    r5 = max(0,x['viewport']-x['controls']-x['pins']*x['pin_width']-x['normal']*x['max_width'])
    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: [({'viewport': 500, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [460, 60, 100, 100, 0, 0]), ({'viewport': 300, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [260, 60, 50, 80, 120, 0]), ({'viewport': 500, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 1, 'min_width': 80, 'max_width': 160}, [460, 60, 400, 160, 0, 240]), ({'viewport': 500, 'controls': 40, 'pins': 0, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [460, 0, 115, 115, 0, 0]), ({'viewport': 900, 'controls': 40, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [860, 60, 200, 160, 0, 160]), ({'viewport': 500, 'controls': 0, 'pins': 2, 'pin_width': 30, 'normal': 4, 'min_width': 80, 'max_width': 160}, [500, 60, 110, 110, 0, 0])], 2: [({'viewport': 1000, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [920, 120, 200, 200, 0, 0]), ({'viewport': 600, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [520, 120, 100, 160, 240, 0]), ({'viewport': 1000, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 1, 'min_width': 160, 'max_width': 320}, [920, 120, 800, 320, 0, 480]), ({'viewport': 1000, 'controls': 80, 'pins': 0, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [920, 0, 230, 230, 0, 0]), ({'viewport': 1800, 'controls': 80, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [1720, 120, 400, 320, 0, 320]), ({'viewport': 1000, 'controls': 0, 'pins': 2, 'pin_width': 60, 'normal': 4, 'min_width': 160, 'max_width': 320}, [1000, 120, 220, 220, 0, 0])], 3: [({'viewport': 1500, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [1380, 180, 300, 300, 0, 0]), ({'viewport': 900, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [780, 180, 150, 240, 360, 0]), ({'viewport': 1500, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 1, 'min_width': 240, 'max_width': 480}, [1380, 180, 1200, 480, 0, 720]), ({'viewport': 1500, 'controls': 120, 'pins': 0, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [1380, 0, 345, 345, 0, 0]), ({'viewport': 2700, 'controls': 120, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [2580, 180, 600, 480, 0, 480]), ({'viewport': 1500, 'controls': 0, 'pins': 2, 'pin_width': 90, 'normal': 4, 'min_width': 240, 'max_width': 480}, [1500, 180, 330, 330, 0, 0])], 4: [({'viewport': 2000, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [1840, 240, 400, 400, 0, 0]), ({'viewport': 1200, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [1040, 240, 200, 320, 480, 0]), ({'viewport': 2000, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 1, 'min_width': 320, 'max_width': 640}, [1840, 240, 1600, 640, 0, 960]), ({'viewport': 2000, 'controls': 160, 'pins': 0, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [1840, 0, 460, 460, 0, 0]), ({'viewport': 3600, 'controls': 160, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [3440, 240, 800, 640, 0, 640]), ({'viewport': 2000, 'controls': 0, 'pins': 2, 'pin_width': 120, 'normal': 4, 'min_width': 320, 'max_width': 640}, [2000, 240, 440, 440, 0, 0])], 5: [({'viewport': 2500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [2300, 300, 500, 500, 0, 0]), ({'viewport': 1500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [1300, 300, 250, 400, 600, 0]), ({'viewport': 2500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 1, 'min_width': 400, 'max_width': 800}, [2300, 300, 2000, 800, 0, 1200]), ({'viewport': 2500, 'controls': 200, 'pins': 0, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [2300, 0, 575, 575, 0, 0]), ({'viewport': 4500, 'controls': 200, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [4300, 300, 1000, 800, 0, 800]), ({'viewport': 2500, 'controls': 0, 'pins': 2, 'pin_width': 150, 'normal': 4, 'min_width': 400, 'max_width': 800}, [2500, 300, 550, 550, 0, 0])]}
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[460, 60, 100, 100, 0, 0][460, 60, 100, 100, 0, 0]Passed
workspace regression 1[260, 60, 50, 80, 20, 0][260, 60, 50, 80, 120, 0]Failed
workspace regression 2[460, 60, 400, 160, 0, 240][460, 60, 400, 160, 0, 240]Passed
workspace regression 3[460, 0, 115, 115, 0, 0][460, 0, 115, 115, 0, 0]Passed
workspace regression 4[860, 60, 200, 160, 0, 160][860, 60, 200, 160, 0, 160]Passed
workspace regression 5[500, 60, 110, 110, 0, 0][500, 60, 110, 110, 0, 0]Passed

SHA-256 / e0d7d50a4453dd3de682df295dfaaf3035662fdfc12e62123c24327dd87b6388

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.

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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 2026-09-29T14:42:44.654314+00:00.

Case digest / c2b6ad26dedfae8efa63b4a2fadf7a81138ac082ad8f5fcbfa67760b077628fc