[PATCH 5/8] t5601: restore `.gitconfig` after includeIf test

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

One test in t5601 overwrites `$HOME/.gitconfig` with an `includeIf`
configuration snippet and removes the file in its cleanup. This
destroys the `safe.bareRepository=all` entry that test-lib.sh
writes when `WITH_BREAKING_CHANGES` is in effect, causing later
tests that use `git -C <bare-repo> config` to fail with "not in a
git directory".

Back up `.gitconfig` before overwriting and restore it in the
cleanup, so the global config survives into subsequent tests.

Assisted-by: Claude Opus 4.6
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t5601-clone.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index d743d986c4..3dd229c186 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -813,7 +813,9 @@ test_expect_success 'clone with includeIf' '
 	test_when_finished "rm -rf repo \"$HTTPD_DOCUMENT_ROOT_PATH/repo.git\"" &&
 	git clone --bare --no-local src "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 
-	test_when_finished "rm \"$HOME\"/.gitconfig" &&
+	test_when_finished "cp \"$HOME\"/.gitconfig.bak \
+		\"$HOME\"/.gitconfig 2>/dev/null || rm -f \"$HOME\"/.gitconfig" &&
+	cp "$HOME"/.gitconfig "$HOME"/.gitconfig.bak 2>/dev/null &&
 	cat >"$HOME"/.gitconfig <<-EOF &&
 	[includeIf "onbranch:something"]
 		path = /does/not/exist.inc
-- 
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