Based on unified-diff 4.0.1, copyright Titus Wormer, under the original MIT license retained in license. Original plugin and API are preserved. Stackline changes select @stackline/git-diff-tree and skip binary/mode-only patches without text hunks. Version 1.0.1 fixes new-file line accounting without changing the public plugin API. Tests are restored from the exact upstream gitHead listed in UPSTREAM.json, with node:test and local temporary Git repositories replacing legacy test tooling.