[PATCH v2] Ignore dirty submodule states during stash

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As stash does not know how to deal with submodules,
it should not try to save/restore their states
as it leads to redundant merge conflicts.

Added test checks if 'stash pop' does not trigger merge conflics
in submodules.

Signed-off-by: Vasily Titskiy <qehgt0@xxxxxxxxx>
---
 git-stash.sh     |  2 +-
 t/t3903-stash.sh | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/git-stash.sh b/git-stash.sh
index c7c65e2..b500c44 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -116,7 +116,7 @@ create_stash () {
 			git read-tree --index-output="$TMPindex" -m $i_tree &&
 			GIT_INDEX_FILE="$TMPindex" &&
 			export GIT_INDEX_FILE &&
-			git diff --name-only -z HEAD -- >"$TMP-stagenames" &&
+			git diff --name-only --ignore-submodules -z HEAD -- >"$TMP-stagenames" &&
 			git update-index -z --add --remove --stdin <"$TMP-stagenames" &&
 			git write-tree &&
 			rm -f "$TMPindex"
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 2142c1f..1be62f3 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -731,4 +731,38 @@ test_expect_success 'stash list --cc shows combined diff' '
 	test_cmp expect actual
 '
 
+test_expect_success 'stash ignores changes in submodules' '
+	git submodule init &&
+	git init sub1 &&
+	(
+		cd sub1 &&
+		echo "x" >file1 &&
+		git add file1 &&
+		git commit -a -m "initial sub1"
+	) &&
+	git submodule add ./. sub1 &&
+	echo "main" >file1 &&
+	git add file1 &&
+	git commit -a -m "initial main" &&
+	# make changes in submodule
+	(
+		cd sub1 &&
+		echo "y" >>file1 &&
+		git commit -a -m "change y"
+	) &&
+	git commit sub1 -m "update reference" &&
+	# switch submodule to another revision
+	(
+		cd sub1 &&
+		echo "z" >>file1 &&
+		git commit -a -m "change z"
+	) &&
+	# everything is prepared, check if changes in submodules are ignored
+	echo "local change" >>file1 &&
+	git stash save &&
+	git checkout HEAD~1 &&
+	git submodule update &&
+	git stash pop
+'
+
 test_done
-- 
2.1.4

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