This reverts commit43bf8801f9. diff-so-fancy was disabled as the interactive diff-filter in43bf8801f9("git:interactive.diffFilter: Disable diff-so-fancy") because of the rewrite in C of `git add -p`. This was fixed in v2.38.0[^1]. [^1]: https://github.com/git/git/blob/v2.38.0/Documentation/RelNotes/2.38.0.txt#L353-L356