FA-75840 / Text diff and three-way merge / Member archive

Diffstat path truncation: the directory separator is dropped after the ellipsis · case 05

Truncated paths read "...file.py" instead of ".../file.py", hiding that a directory was cut.

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Case contract

A path longer than width is shown as "..." plus its last width-3 characters, further shortened to start at the first "/" inside that tail when there is one (keeping the slash). Paths not longer than width are unchanged.

Why this case matters

Narrow terminals truncate long paths in diffstat output; the rule keeps the most informative part of the path.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
long name cut at a directory boundary	`["...file_name.py"]`	`[".../file_name.py"]`	Failed

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