FA-75683 / Text diff and three-way merge / Member archive

Intraline change pairing: removed lines pair with additions after intervening context · case 03

A deletion is highlighted against an unrelated insertion further down.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Within each block of consecutive "-" lines immediately followed by consecutive "+" lines, pair the i-th removed line with the i-th added line (extra lines stay unpaired). For each pair report the common prefix length and the common suffix length, where the suffix may not overlap the prefix. Return [old, new, prefix, suffix] rows.

Why this case matters

Word and character highlighting inside changed lines depends on pairing lines and trimming their shared ends.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
pairs do not cross context	`[["old", "new", 0, 0]]`	`[]`	Failed

MEMBER ARCHIVE

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