emit DC_EVENT_MSGS_NOTICED when a chat was answered on another device

deltachat-ffi/deltachat.h

@@ -4558,7 +4558,8 @@ void dc_event_unref(dc_event_t* event);
  * Messages were marked noticed or seen.
  * The ui may update badge counters or stop showing a chatlist-item with a bold font.
  *
- * This event is emitted eg. when calling dc_markseen_msgs(), dc_marknoticed_chat() or dc_marknoticed_contact().
+ * This event is emitted eg. when calling dc_markseen_msgs(), dc_marknoticed_chat() or dc_marknoticed_contact()
+ * or when a chat is answered on another device.
  * Do not try to derive the state of an item from just the fact you received the event;
  * use eg. dc_msg_get_state() or dc_get_fresh_msg_cnt() for this purpose.
  *

src/chat.rs

@@ -1744,6 +1744,27 @@ pub async fn get_chat_msgs(
     }
 }
 
+pub(crate) async fn marknoticed_chat_if_older_than(
+    context: &Context,
+    chat_id: ChatId,
+    timestamp: i64,
+) -> Result<(), Error> {
+    if let Some(chat_timestamp) = context
+        .sql
+        .query_get_value(
+            context,
+            "SELECT MAX(timestamp) FROM msgs WHERE chat_id=?",
+            paramsv![chat_id],
+        )
+        .await
+    {
+        if timestamp > chat_timestamp {
+            marknoticed_chat(context, chat_id).await?;
+        }
+    }
+    Ok(())
+}
+
 pub async fn marknoticed_chat(context: &Context, chat_id: ChatId) -> Result<(), Error> {
     // "WHERE" below uses the index `(state, hidden, chat_id)`, see get_fresh_msg_cnt() for reasoning
     if !context

src/dc_receive_imf.rs

@@ -845,6 +845,11 @@ async fn add_parts(
         "Message has {} parts and is assigned to chat #{}.", icnt, chat_id,
     );
 
+    // new outgoing message from another device marks the chat as noticed.
+    if !incoming && !*hidden && !chat_id.is_special() {
+        chat::marknoticed_chat_if_older_than(context, chat_id, sort_timestamp).await?;
+    }
+
     // check event to send
     if chat_id.is_trash() || *hidden {
         *create_event_to_send = None;