FA-37261 / Table interactions / Open access

Table clipboard serialization: newline quoting · case 01

The table newline quoting result violates the stipulated table clipboard serialization contract.

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

ROOT CAUSE

The newline quoting decision uses '(\'\\t\',\'"\')' instead of '(\'\\t\',\'\\n\',\'"\')'.

VERIFIED REPAIR

Apply the complete newline quoting rule: ('\t','\n','"').

Unsuccessful approach: The attempted repair "('\\t',)" still loses a required part of the table contract.

Case contract

Serialize selected rows in current table order and copyable visible columns in schema order. Optional labels precede records, display/raw selection is explicit, None is empty while zero is retained, TSV-special cells use doubled quotes, and records use CRLF without a trailing separator.

Why this case matters

An offline table UI model isolates table clipboard serialization, 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(rows, columns, selected, hidden, include_headers, raw):
    cols=[c for c in columns if c['id'] not in hidden and c.get('copy',True)]
    rr=[r for r in rows if r['id'] in selected]
    def text(v):
        s='' if v is None else str(v)
        return '"'+s.replace('"','""')+'"' if any(x in s for x in ('\t','"')) else s
    lines=[]
    if include_headers: lines.append('\t'.join(text(c['label']) for c in cols))
    for r in rr:
        values=[r.get(c['id']) if raw else r.get('_display',{}).get(c['id'],r.get(c['id'])) for c in cols]
        lines.append('\t'.join(text(v) for v in values))
    return '\r\n'.join(lines)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('display selected rows', solve([{'id':'r1','a':1,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 2:
    check('display selected rows', solve([{'id':'r1','a':2,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 3:
    check('display selected rows', solve([{'id':'r1','a':3,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 4:
    check('display selected rows', solve([{'id':'r1','a':4,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 5:
    check('display selected rows', solve([{'id':'r1','a':5,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

check('variant formatted clipboard value', solve([{'id':'r','a':N,'_display':{'a':'value'+str(N)}}], [{'id':'a','label':'A'}], ['r'], [], False, False), 'value'+str(N))
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
display selected rows	`Alpha Beta shown 0 x`	`Alpha Beta shown 0 x`	Passed
quoted cells	`"x""y" line next "x y"`	`"x""y" "line next" "x y"`	Failed
hidden private	`3`	`3`	Passed
raw mode	`2`	`2`	Passed
header-only	`Alpha`	`Alpha`	Passed
no selection			Passed
variant formatted clipboard value	`value1`	`value1`	Passed

SHA-256 / c07ec06cdc0b204fc8415685c3b28bb945e25d75540f20b9c1fe7bab4e5497fd

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(rows, columns, selected, hidden, include_headers, raw):
    cols=[c for c in columns if c['id'] not in hidden and c.get('copy',True)]
    rr=[r for r in rows if r['id'] in selected]
    def text(v):
        s='' if v is None else str(v)
        return '"'+s.replace('"','""')+'"' if any(x in s for x in ('\t',)) else s
    lines=[]
    if include_headers: lines.append('\t'.join(text(c['label']) for c in cols))
    for r in rr:
        values=[r.get(c['id']) if raw else r.get('_display',{}).get(c['id'],r.get(c['id'])) for c in cols]
        lines.append('\t'.join(text(v) for v in values))
    return '\r\n'.join(lines)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('display selected rows', solve([{'id':'r1','a':1,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 2:
    check('display selected rows', solve([{'id':'r1','a':2,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 3:
    check('display selected rows', solve([{'id':'r1','a':3,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 4:
    check('display selected rows', solve([{'id':'r1','a':4,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 5:
    check('display selected rows', solve([{'id':'r1','a':5,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

check('variant formatted clipboard value', solve([{'id':'r','a':N,'_display':{'a':'value'+str(N)}}], [{'id':'a','label':'A'}], ['r'], [], False, False), 'value'+str(N))
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
display selected rows	`Alpha Beta shown 0 x`	`Alpha Beta shown 0 x`	Passed
quoted cells	`x"y line next "x y"`	`"x""y" "line next" "x y"`	Failed
hidden private	`3`	`3`	Passed
raw mode	`2`	`2`	Passed
header-only	`Alpha`	`Alpha`	Passed
no selection			Passed
variant formatted clipboard value	`value1`	`value1`	Passed

SHA-256 / 0851b241b925328ebf0b0d2c62cd09dec7dca8b21aad18fbfc0d8884bf640951

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(rows, columns, selected, hidden, include_headers, raw):
    cols=[c for c in columns if c['id'] not in hidden and c.get('copy',True)]
    rr=[r for r in rows if r['id'] in selected]
    def text(v):
        s='' if v is None else str(v)
        return '"'+s.replace('"','""')+'"' if any(x in s for x in ('\t','\n','"')) else s
    lines=[]
    if include_headers: lines.append('\t'.join(text(c['label']) for c in cols))
    for r in rr:
        values=[r.get(c['id']) if raw else r.get('_display',{}).get(c['id'],r.get(c['id'])) for c in cols]
        lines.append('\t'.join(text(v) for v in values))
    return '\r\n'.join(lines)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('display selected rows', solve([{'id':'r1','a':1,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 2:
    check('display selected rows', solve([{'id':'r1','a':2,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 3:
    check('display selected rows', solve([{'id':'r1','a':3,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 4:
    check('display selected rows', solve([{'id':'r1','a':4,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 5:
    check('display selected rows', solve([{'id':'r1','a':5,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

check('variant formatted clipboard value', solve([{'id':'r','a':N,'_display':{'a':'value'+str(N)}}], [{'id':'a','label':'A'}], ['r'], [], False, False), 'value'+str(N))
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
display selected rows	`Alpha Beta shown 0 x`	`Alpha Beta shown 0 x`	Passed
quoted cells	`"x""y" "line next" "x y"`	`"x""y" "line next" "x y"`	Passed
hidden private	`3`	`3`	Passed
raw mode	`2`	`2`	Passed
header-only	`Alpha`	`Alpha`	Passed
no selection			Passed
variant formatted clipboard value	`value1`	`value1`	Passed

SHA-256 / 5981d927f7a37deb30551e3ed5974458bafc184a19eac1992fa8851d4eda7107

Verification & scope

Source row/column IDs are unique. Cell strings exclude lone carriage returns; quoting models tabs, LF, and double quotes only. 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 2026-09-29T14:42:59.465997+00:00.

Case digest / d3cc767100ee4bbb7605f7cf9bca884d560e355aed79624d2733c967fefbe508