fix: no implicit member changes when we are added to the group (#6493)

Author: link2xt

src/receive_imf.rs

@@ -2456,7 +2456,11 @@ async fn apply_group_changes(
     if let Some(removed_id) = removed_id {
         removed_ids.remove(&removed_id);
     }
-    let group_changes_msgs = group_changes_msgs(context, &added_ids, &removed_ids, chat_id).await?;
+    let group_changes_msgs = if self_added {
+        Vec::new()
+    } else {
+        group_changes_msgs(context, &added_ids, &removed_ids, chat_id).await?
+    };
 
     if let Some(avatar_action) = &mime_parser.group_avatar {
         if !new_chat_contacts.contains(&ContactId::SELF) {

src/receive_imf/receive_imf_tests.rs

@@ -5551,3 +5551,34 @@ async fn test_default_member_timestamps_to_zero() -> Result<()> {
     assert_eq!(chat::get_chat_contacts(bob, chat.id).await?.len(), 3);
     Ok(())
 }
+
+/// Regression test for the bug
+/// that resulted in an info message
+/// about Bob addition to the group on Fiona's device.
+///
+/// There should be no info messages about implicit
+/// member changes when we are added to the group.
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_two_group_securejoins() -> Result<()> {
+    let mut tcm = TestContextManager::new();
+    let alice = &tcm.alice().await;
+    let bob = &tcm.bob().await;
+    let fiona = &tcm.fiona().await;
+
+    let group_id = chat::create_group_chat(alice, ProtectionStatus::Protected, "Group").await?;
+
+    let qr = get_securejoin_qr(alice, Some(group_id)).await?;
+
+    // Bob joins using QR code.
+    tcm.exec_securejoin_qr(bob, alice, &qr).await;
+
+    // Fiona joins using QR code.
+    tcm.exec_securejoin_qr(fiona, alice, &qr).await;
+
+    let fiona_chat_id = fiona.get_last_msg().await.chat_id;
+    fiona
+        .golden_test_chat(fiona_chat_id, "two_group_securejoins")
+        .await;
+
+    Ok(())
+}

test-data/golden/two_group_securejoins

@@ -0,0 +1,9 @@
+Group#Chat#11: Group [3 member(s)] 🛡️
+--------------------------------------------------------------------------------
+Msg#11: info (Contact#Contact#Info): [email protected] invited you to join this group.
+
+Waiting for the device of [email protected] to reply… [NOTICED][INFO]
+Msg#13: info (Contact#Contact#Info): [email protected] replied, waiting for being added to the group… [NOTICED][INFO]
+Msg#17: info (Contact#Contact#Info): Messages are guaranteed to be end-to-end encrypted from now on. [NOTICED][INFO 🛡️]
+Msg#18🔒:  (Contact#Contact#10): Member Me ([email protected]) added by [email protected]. [FRESH][INFO]
+--------------------------------------------------------------------------------