FA-75598 / Text diff and three-way merge / Member archive

Rename similarity pairing: a small file inside a large one scores 100 · case 03

A three-line file is reported as renamed to a large file that merely contains it.

Member previewVariant 3 · 3 implementations · 12 checks per implementation

Case contract

For deleted and added files (path -> lines), a pair scores floor(100 * multiset-common-lines / max(len_a, len_b)); empty files never pair. Pairs scoring at least the threshold are taken greedily by descending score, ties by (deleted path, added path) ascending, each file used at most once. Return [deleted, added, score] triples sorted by deleted path.

Why this case matters

Rename and copy detection decides whether a delete plus an add is shown as a rename with a small diff.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
small file inside a big one	`[["small", "big", 100]]`	`[]`	Failed

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