Configuration for global ignore patterns in ~/.config/git/config:
[core]
excludesfile = .gitignore
doesn't get looked up per default in ~/.config/git/ which might be
considered a bug as the .gitignore file isn't loaded. It's only loaded
when .gitignore is located in $HOME or explicitly referenced via
~/.config/git/.gitignore.
Configuration for a conditional include also in ~/.config/git/config:
[includeIf "gitdir:~/Work/git-repos/"]
path = .oss-gitconfig
does get looked up per default in ~/.config/git/ and therefor the
.oss-gitconfig is loaded.
So there seems to be a difference in Git's configuration loading strategies.
Environment details:
macOS High Sierra
git version 2.19.1
Windows 10
git version 2.16.1.windows.2