trailing recursive globs shouldn't ignore the directory itself, only its contents

[foophoof]

I have a .gitignore file that contains something like this:

vendor/**
!vendor/manifest

I'd expect vendor/manifest to be searched, but nothing else in the vendor directory, but instead it seems like vendor/manifest is ignored too. If I remove the vendor/** line, the search does what I expect it to.

[BurntSushi]

This is an interesting case, because rg will avoid descending into the vendor, which appears wrong, since vendor itself shouldn't be ignored. From man gitignore:

       ·   A trailing "/**" matches everything inside. For example, "abc/**" matches all files inside directory "abc",
           relative to the location of the .gitignore file, with infinite depth.

(Running rg with the --debug flag told me that vendor itself was ignored. rg never even sees vendor/manifest.)