feat req. `git config status.showUntrackedFiles all` and tab to expand on untracked folder

[doctorguile]

I assume this is feature parity with emacs magit.

see shell history below for raw git behavior

% mkdir proj
% cd proj
% git init
Initialized empty Git repository in /private/tmp/proj/.git/
% mkdir subdir
% touch a.txt subdir/b.txt  subdir/c.txt
% git status

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        a.txt
        subdir/

% git config status.showUntrackedFiles all

% git status

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        a.txt
        subdir/b.txt
        subdir/c.txt

emacs magit also respect the showUntrackedFiles all setting

hitting [tab] on the untracked dir will now expand

In the beginning there was darkness

Untracked files (2)
a.txt
subdir/
subdir/b.txt
subdir/c.txt

before setting showUntrackedFiles , emacs magit behaves like gitu where you cannot tab expand on untracked dir

I frequently have to selectively add files under untracked dir.

Is it possible to have tab expand like emacs magit?
Or maybe there are other workarounds?

Thanks