Currently I'm not sure what the intent of this test is, so it's not
clear if the new answer is better or worse than the old one.
test_expect_equal_file $EXPECTED/notmuch-show-thread-maildir-storage-with-fourfold-indentation OUTPUT
test_begin_subtest "notmuch-show for message with invalid From"
+test_subtest_broken_gmime_3
add_message "[subject]=\"message-with-invalid-from\"" \
"[from]=\"\\\"Invalid \\\" From\\\" <test_suite@notmuchmail.org>\""
thread=$(notmuch search --output=threads subject:message-with-invalid-from)