fix: ignore parent message if message references itself

When there are no parent references,
Delta Chat inserts Message-ID into References.
Such references should be ignored
because otherwise fully downloaded message
may be assigned to the same chat as previously incorrectly assigned
partially downloaded message.

Fixes receive_imf::tests::test_create_group_with_big_msg

src/receive_imf.rs

@@ -703,7 +703,9 @@ async fn add_parts(
         better_msg = Some(stock_str::msg_location_enabled_by(context, from_id).await);
     }
 
-    let parent = get_parent_message(context, mime_parser).await?;
+    let parent = get_parent_message(context, mime_parser)
+        .await?
+        .filter(|p| Some(p.id) != replace_msg_id);
 
     let is_dc_message = if mime_parser.has_chat_version() {
         MessengerMessage::Yes