Send MDNs for messages deleted on the server

Now MarkseenMsgOnImap sends MDN even if it can't mark the message as
seen on the server.

To prevent multiple MDNs from being sent, MarkseenMsgOnImap is postponed
until the message is detected in a folder from which it is not going to
be moved.

src/dc_receive_imf.rs

@@ -224,24 +224,29 @@ pub async fn dc_receive_imf(
                 )
                 .await;
             }
-        } else {
+        } else if insert_msg_id
+            .needs_move(context, server_folder.as_ref())
+            .await
+            .unwrap_or_default()
+        {
             // Move message if we don't delete it immediately.
-            context
-                .do_heuristics_moves(server_folder.as_ref(), insert_msg_id)
-                .await;
-            if !mime_parser.mdn_reports.is_empty() && mime_parser.has_chat_version() {
-                // This is a Delta Chat MDN. Mark as read.
-                job::add(
-                    context,
-                    job::Job::new(
-                        Action::MarkseenMsgOnImap,
-                        insert_msg_id.to_u32(),
-                        Params::new(),
-                        0,
-                    ),
-                )
-                .await;
-            }
+            job::add(
+                context,
+                job::Job::new(Action::MoveMsg, insert_msg_id.to_u32(), Params::new(), 0),
+            )
+            .await;
+        } else if !mime_parser.mdn_reports.is_empty() && mime_parser.has_chat_version() {
+            // This is a Delta Chat MDN. Mark as read.
+            job::add(
+                context,
+                job::Job::new(
+                    Action::MarkseenMsgOnImap,
+                    insert_msg_id.to_u32(),
+                    Params::new(),
+                    0,
+                ),
+            )
+            .await;
         }
     }