add failing test for mailinglists with footer in an extra mimepart

src/dc_receive_imf.rs

@@ -2024,7 +2024,7 @@ fn dc_create_incoming_rfc724_mid(
 mod tests {
     use super::*;
 
-    use crate::chat::{ChatItem, ChatVisibility};
+    use crate::chat::{get_chat_msgs, ChatItem, ChatVisibility};
     use crate::chatlist::Chatlist;
     use crate::constants::{DC_CHAT_ID_DEADDROP, DC_CONTACT_ID_INFO, DC_GCL_NO_SPECIALS};
     use crate::message::ContactRequestDecision::*;
@@ -3112,6 +3112,42 @@ mod tests {
         assert_eq!(chat.name, "DPD");
     }
 
+    #[async_std::test]
+    async fn test_mailing_list_with_mimepart_footer() {
+        let t = TestContext::new_alice().await;
+        t.set_config(Config::ShowEmails, Some("2")).await.unwrap();
+        let deaddrop = ChatId::new(DC_CHAT_ID_DEADDROP);
+        assert_eq!(get_chat_msgs(&t, deaddrop, 0, None).await.len(), 0);
+
+        // the mailing list message contains two top-level texts.
+        // the second text is a footer that is added by some mailing list software
+        // if the user-edited text contains html.
+        // this footer should not become a text-message in delta chat
+        // (otherwise every second mail might be the same footer)
+        dc_receive_imf(
+            &t,
+            include_bytes!("../test-data/message/mailinglist_with_mimepart_footer.eml"),
+            "INBOX",
+            1,
+            false,
+        )
+        .await
+        .unwrap();
+        let msg = t.get_last_msg().await;
+        assert_eq!(
+            msg.text,
+            Some("[Intern] important stuff – Hi mr ... [text part]".to_string())
+        );
+        assert!(msg.has_html());
+        let chat = Chat::load_from_db(&t, msg.chat_id).await.unwrap();
+        assert_eq!(get_chat_msgs(&t, deaddrop, 0, None).await.len(), 1);
+        assert_eq!(get_chat_msgs(&t, msg.chat_id, 0, None).await.len(), 1);
+        assert_eq!(chat.typ, Chattype::Mailinglist);
+        assert_eq!(chat.blocked, Blocked::Deaddrop);
+        assert_eq!(chat.grpid, "intern.lists.abc.de");
+        assert_eq!(chat.name, "Intern");
+    }
+
     #[async_std::test]
     async fn test_dont_show_tokens_in_contacts_list() {
         check_dont_show_in_contacts_list(

test-data/message/mailinglist_with_mimepart_footer.eml

@@ -0,0 +1,69 @@
+Return-Path: <intern-bounces@lists.abc.de>
+X-Original-To: bp@def.com
+Delivered-To: m1234567@dd12345.abcserver.com
+X-policyd-weight: using cached result; rate:hard: -6.1
+Received: from mail.alfi.li (mail.alfi.li [85.14.254.25])
+	by dd12345.abcserver.com (Postfix) with ESMTPS id AF73653C05E0
+	for <bp@def.com>; Sat, 20 Feb 2021 22:04:26 +0100 (CET)
+To: intern@lists.abc.de
+References: <1234565f-e80e-7b88-7b99-3962b40b53dd@mr.de>
+From: s l <s@sl.de>
+Message-ID: <7753a9a4-b8fe-03a5-81cd-687b05596640@sl.de>
+Date: Sat, 20 Feb 2021 22:05:57 +0100
+In-Reply-To: <1234565f-e80e-7b88-7b99-3962b40b53dd@mr.de>
+Content-Language: de-DE
+X-MBO-SPAM-Probability: 
+X-Rspamd-Score: -3.77 / 15.00 / 15.00
+X-Rspamd-UID: 01315b
+Subject: [Intern] important stuff
+X-BeenThere: intern@lists.abc.de
+X-Mailman-Version: 2.1.29
+Precedence: list
+List-Id: <intern.lists.abc.de>
+List-Unsubscribe: <http://lists.abc.de/mailman/options/intern>,
+ <mailto:intern-request@lists.abc.de?subject=unsubscribe>
+List-Archive: <http://lists.abc.de/mailman/private/intern/>
+List-Post: <mailto:intern@lists.abc.de>
+List-Help: <mailto:intern-request@lists.abc.de?subject=help>
+List-Subscribe: <http://lists.abc.de/mailman/listinfo/intern>,
+ <mailto:intern-request@lists.abc.de?subject=subscribe>
+Content-Type: multipart/mixed; boundary="===============4579664526791456147=="
+Errors-To: intern-bounces@lists.abc.de
+Sender: "Intern" <intern-bounces@lists.abc.de>
+
+
+This is a multi-part message in MIME format.
+--===============4579664526791456147==
+Content-Type: multipart/alternative;
+ boundary="------------D54E6E735C08D54533EF8F41"
+Content-Language: de-DE
+
+This is a multi-part message in MIME format.
+--------------D54E6E735C08D54533EF8F41
+Content-Type: text/plain; charset=utf-8; format=flowed
+Content-Transfer-Encoding: 8bit
+
+Hi mr ... [text part]
+
+--------------D54E6E735C08D54533EF8F41
+Content-Type: text/html; charset=utf-8
+Content-Transfer-Encoding: 8bit
+
+<html>Hi mr ... [html part]</html>
+
+--------------D54E6E735C08D54533EF8F41--
+
+--===============4579664526791456147==
+Content-Type: text/plain; charset="us-ascii"
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline
+
+_______________________________________________
+Intern mailing list
+Intern@lists.abc.de
+http://lists.abc.de/mailman/listinfo/intern
+[this footer is a separate text/plain part,
+added by some ml software if the editable text is html]
+
+--===============4579664526791456147==--
+