stash: keep untracked files intact in stash -k

Currently when there are untracked changes in a file "one" and in a file
"two" in the repository and the user uses:

    git stash push -k one

all changes in "two" are wiped out completely.  That is clearly not the
intended result.  Make sure that only the files given in the pathspec
are changed when git stash push -k <pathspec> is used.

Reported-by: Jeff King <peff@peff.net>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-stash.sh

@@ -314,7 +314,9 @@ push_stash () {
 
 		if test "$keep_index" = "t" && test -n "$i_tree"
 		then
-			git read-tree --reset -u $i_tree
+			git read-tree --reset $i_tree
+			git ls-files -z --modified -- "$@" |
+			git checkout-index -z --force --stdin
 		fi
 	else
 		git apply -R < "$TMP-patch" ||

t/t3903-stash.sh

@@ -907,4 +907,18 @@ test_expect_success 'stash without verb with pathspec' '
 	test_path_is_file bar
 '
 
+test_expect_success 'stash -k -- <pathspec> leaves unstaged files intact' '
+	git reset &&
+	>foo &&
+	>bar &&
+	git add foo bar &&
+	git commit -m "test" &&
+	echo "foo" >foo &&
+	echo "bar" >bar &&
+	git stash -k -- foo &&
+	test "",bar = $(cat foo),$(cat bar) &&
+	git stash pop &&
+	test foo,bar = $(cat foo),$(cat bar)
+'
+
 test_done