Re: Regression[2.14.3->2.15]: Interactive rebase fails if submodule is modified

> > What I tried to do for reproducing is:
> > rm -rf super sub
> > mkdir sub; cd sub; git init
> > git commit --allow-empty -m 'Initial commit'
> > mkdir ../super; cd ../super
> > git init
> > git submodule add ../sub
> > touch foo; git add foo sub
> > git commit -m 'Initial commit'
> > touch a; git add a; git commit -m 'a'
> > touch b; git add b; git commit -m 'b'
> > cd sub; git commit --allow-empty -m 'New commit'; cd ..
> > git rebase -i HEAD^^
> > 
> > Then drop a.
> > 
> > In my project I get:
> > error: cannot rebase: You have unstaged changes.
> > 
> > This works fine with 2.14.3.
> 
> I tried to turn this into a regression test, but I cannot make it fail:
> 
> -- snip --
> diff --git a/t/t3426-rebase-submodule.sh b/t/t3426-rebase-submodule.sh
> index ebf4f5e4b2c..55aebe53191 100755
> --- a/t/t3426-rebase-submodule.sh
> +++ b/t/t3426-rebase-submodule.sh
> @@ -20,7 +20,7 @@ git_rebase () {
>  	git rebase "$1"
>  }
>  
> -test_submodule_switch "git_rebase"
> +#test_submodule_switch "git_rebase"
>  
>  git_rebase_interactive () {
>  	git status -su >expect &&
> @@ -38,6 +38,27 @@ git_rebase_interactive () {
>  	git rebase -i "$1"
>  }
>  
> -test_submodule_switch "git_rebase_interactive"
> +#test_submodule_switch "git_rebase_interactive"
> +
> +test_expect_success '123' '
> +	git init sub &&
> +	test_commit -C sub init-submodule &&
> +	git init super &&
> +	git -C super submodule add ../sub &&
> +	(
> +		cd super &&
> +		test_tick &&
> +		touch foo &&
> +		git add sub foo &&
> +		git commit -m initial &&
> +		test_commit a &&
> +		test_commit b &&
> +		test_commit -C sub new &&
> +		set_fake_editor &&
> +		FAKE_LINES=2 &&
> +		export FAKE_LINES &&