.gitignore exclusions not being honoring correctly

Hello,

I am having an issue with inconsistent behavior when trying to exclude folders using a .gitignore. This issue is related to: https://github.com/git-tfs/git-tfs/issues/1047

Given the following repository directory:

/Main/.gitignore
/Main/Foo/test.txt
/Main/Foo/packages/test.txt
/Main/FooBar/test.txt
/Main/FooBar/packages/test.txt

And the following .gitignore file:

**/packages/*
!Foo/
!Foo/**

When I running the following code:

using (var repo = new Repository(@"C:\Git\Project\Main"))
{
	repo.RetrieveStatus().Untracked.Dump();
}

Then I get to following results:

.gitignore
Foo\test.txt
FooBar\test.txt

When I run git status -u
Then I get to following results:

.gitignore
Foo/packages/test.txt
Foo/test.txt
FooBar/test.txt

I have also tried populating the ignore rules manually using AddTemporaryRules with the same results.

Thanks!

Christopher Haws

git version 2.10.2.windows.1
LibGit2Sharp version 0.23.1

Reproduce the report with Repository.RetrieveStatus and the shown nested .gitignore rules, then compare its Untracked results with git status -u. Also check the AddTemporaryRules path, and consider the issue done when negated directory rules produce the same included files as Git.