checkout: implement "-" abbreviation, add docs and tests

diff --git a/t/t4128-apply-root.sh b/t/t4128-apply-root.sh
index bc7a8a8689c8ca2b9902c577c9d9bdd1fa97815c..8f6aea48d84621ae3b7304636452c724a4bbe5b6 100755 (executable)
--- a/t/t4128-apply-root.sh
+++ b/t/t4128-apply-root.sh
@@ -72,7 +72,7 @@ test_expect_success 'apply --directory (delete file)' '
        echo content >some/sub/dir/delfile &&
        git add some/sub/dir/delfile &&
        git apply --directory=some/sub/dir/ --index patch &&
-       ! git ls-files | grep delfile
+       ! (git ls-files | grep delfile)
 '
 
 cat > patch << 'EOF'