Re: submodule.<name>.ignore vs git add -u

> Let's say I have a fairly simple submodule setup where I do 'git
> checkout' inside the submodule to check out a different commit, so the
> outer repo 'git diff' shows a submodule update.
> 
> In that case
> 
>         git config submodule.<name>.ignore all
> 
> makes 'git diff' or 'git commit -a' ignore the change in the outer repo,
> but not 'git add -u'.
> 
> Reading the git-config documentation if this is intentional behavior,
> I'm a bit confused. It specifies that:
> 
> - "git status" and the diff family: handle this setting
> - git submodule commands: ignore this setting
> 
> So that about 'git add -u', is it expected that it ignores this setting
> as well?
> 
> I guess either the doc should say 'git add -u' doesn't handle this
> setting or 'git add -u' should handle it. Happy to try to make a patch
> that does the later, but I though better ask first. :-)