Only gitignore lib dir at repo root

[jakebailey]

See: #54637 (comment)

When I deleted the top-level lib dir, I gitignored it. However, gitignore entries are not absolute and so lib/ matched any dir named lib anywhere in the repo, including src/lib.

[RyanCavanaugh]

TIL

[fatcerberus]

gitignore entries are not absolute and so lib/ matched any dir named lib

I was just musing about this to myself the other day, too. It was like a mini-epiphany, “Wait, if *.foo ignores all .foo files anywhere in the tree then does that imply foo/ is also a partial match?” I didn’t follow up on it with a Google search, but it turns out I was onto something after all!

[jakebailey]

Yeah, usually it's desirable (e.g. ignore node_modules/ anywhere), but in this case, not so much.