$ git checkout phpcs-fixes # a branch without .gitignore
$ git status
On branch phpcs-fixes
Untracked files:
  (use "git add <file>..." to include in what will be committed)

        composer.lock
        vendor/
[...]
$ git checkout 7371da2eb0c7 # this commit
$ git status
git status
HEAD detached at 7371da2
nothing to commit, working directory clean