Re: [PATCH v4 00/13] Sparse-checkout: modify 'git add', 'git rm', and 'git mv' behavior

> Updates in v4
> =============
>
>  * Instead of using 'git status' and 'grep' to detect staged changes, we use
>    'git diff --staged'. t1092 uses an additional --diff-filter because it
>    tests with merge conflicts, so it needs this extra flag.
>
>  * Patches 3 and 4 are merged into the new patch 3 to avoid temporarily
>    having a poorly named method.
>
>

>
> Range-diff vs v3:
>
>   1:  ea940f10a7c !  1:  642b05fc020 t3705: test that 'sparse_entry' is unstaged
>      @@ t/t3705-add-sparse-checkout.sh: setup_gitignore () {
>        }
>
>       +test_sparse_entry_unstaged () {
>      -+ git status --porcelain >actual &&
>      -+ ! grep "^[MDARCU][M ] sparse_entry\$" actual
>      ++ git diff --staged -- sparse_entry >diff &&
>      ++ test_must_be_empty diff
>       +}
>       +
>        test_expect_success 'setup' "
>   2:  c7dedb41291 !  2:  58389edc76c t1092: behavior for adding sparse files
>      @@ t/t1092-sparse-checkout-compatibility.sh: test_sparse_match () {
>       + file=$1 &&
>       + for repo in sparse-checkout sparse-index
>       + do
>      -+         git -C $repo status --porcelain >$repo-out &&
>      -+         ! grep "^A  $file\$" $repo-out &&
>      -+         ! grep "^M  $file\$" $repo-out || return 1
>      ++         # Skip "unmerged" paths
>      ++         git -C $repo diff --staged --diff-filter=ACDMRTXB -- "$file" >diff &&