FA-75523 / Text diff and three-way merge / Member archive

Diffstat histogram: small changes vanish from a scaled bar · case 03

A file with one changed line shows no marks next to a large file.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Files are [path, added, removed], with None counts for binary files. Each text file prints "path | total +++---"; when the largest total exceeds width, both counts scale by width/max with floor, but a non-zero count keeps at least one mark. Binary files print "path | Bin". The summary counts files and, when non-zero, insertions and deletions with singular/plural wording.

Why this case matters

Diffstat output is how reviewers size a change; scaling and pluralization rules are easy to get subtly wrong.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
scaled bar keeps small counts visible	`["big.c \| 200 ++++++++++++++++++++", "tiny.c \| 2 ", "2 files changed, 201 insertions(+), 1 deletion(-)"]`	`["big.c \| 200 ++++++++++++++++++++", "tiny.c \| 2 +-", "2 files changed, 201 insertions(+), 1 deletion(-)"]`	Failed

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