.gitignore also supports negated patterns prefixed with "!" [.gitignore]. This should be added to [git_addfn()] analog to [bzr_addfn()].
[.gitignore]: https://git-scm.com/docs/gitignore#_pattern_format [git_addfn()]: https://git.savannah.gnu.org/cgit/tar.git/tree/src/exclist.c#n215 [bzr_addfn()]: https://git.savannah.gnu.org/cgit/tar.git/tree/src/exclist.c#n235
