Merge branch 'jk/stash-require-clean-index' into maint

A hotfix for the topic already in 'master'.

* jk/stash-require-clean-index:
  Revert "stash: require a clean index to apply"

git-stash.sh

@@ -457,8 +457,6 @@ apply_stash () {
 	assert_stash_like "$@"
 
 	git update-index -q --refresh || die "$(gettext "unable to refresh index")"
-	git diff-index --cached --quiet --ignore-submodules HEAD -- ||
-		die "$(gettext "Cannot apply stash: Your index contains uncommitted changes.")"
 
 	# current index state
 	c_tree=$(git write-tree) ||

t/t3903-stash.sh

@@ -45,13 +45,6 @@ test_expect_success 'applying bogus stash does nothing' '
 	test_cmp expect file
 '
 
-test_expect_success 'apply requires a clean index' '
-	test_when_finished "git reset --hard" &&
-	echo changed >other-file &&
-	git add other-file &&
-	test_must_fail git stash apply
-'
-
 test_expect_success 'apply does not need clean working directory' '
 	echo 4 >other-file &&
 	git stash apply &&