More multidevice fixes; it's still not working completely

Author: Hocuri

src/chat/chat_tests.rs

@@ -3785,7 +3785,9 @@ async fn test_sync_broadcast() -> Result<()> {
     assert_eq!(a1_broadcast_chat.get_name(), a0_broadcast_chat.get_name());
     assert!(get_chat_contacts(alice1, a1_broadcast_id).await?.is_empty());
     add_contact_to_chat(alice0, a0_broadcast_id, a0b_contact_id).await?;
-    sync(alice0, alice1).await;
+    let sent = alice0.pop_sent_msg().await;
+    let rcvd = alice1.recv_msg(&sent).await;
+    dbg!(rcvd); // TODO
 
     // This also imports Bob's key from the vCard.
     // Otherwise it is possible that second device

src/mimefactory.rs

@@ -1404,7 +1404,6 @@ impl MimeFactory {
                     }
                 }
                 SystemMessage::MemberAddedToGroup => {
-                    ensure!(chat.typ != Chattype::OutBroadcast);
                     // TODO: lookup the contact by ID rather than email address.
                     // We are adding key-contacts, the cannot be looked up by address.
                     let email_to_add = msg.param.get(Param::Arg).unwrap_or_default();

src/receive_imf.rs

@@ -3482,15 +3482,17 @@ async fn apply_out_broadcast_changes(
     .await?;
 
     if let Some(_removed_addr) = mime_parser.get_header(HeaderDef::ChatGroupMemberRemoved) {
-        // The sender of the message left the broadcast channel
-        remove_from_chat_contacts_table(context, chat.id, from_id).await?;
-
-        return Ok(GroupChangesInfo {
-            better_msg: Some("".to_string()),
-            added_removed_id: None,
-            silent: true,
-            extra_msgs: vec![],
-        });
+        if from_id != ContactId::SELF {
+            // The sender of the message left the broadcast channel
+            remove_from_chat_contacts_table(context, chat.id, from_id).await?;
+
+            return Ok(GroupChangesInfo {
+                better_msg: Some("".to_string()),
+                added_removed_id: None,
+                silent: true,
+                extra_msgs: vec![],
+            });
+        }
     }
 
     if send_event_chat_modified {

src/tools.rs

@@ -306,6 +306,7 @@ pub(crate) fn create_id() -> String {
 /// and is returned as 64 Base64 characters, each containing 6 bits of entropy.
 /// 384 is chosen because it is sufficiently secure
 /// (larger than AES-128 keys used for message encryption)
+/// TODO: Is it still true that we use AES-128? This info is taken from create_id() comment above.
 /// and divides both by 8 (byte size) and 6 (number of bits in a single Base64 character).
 // TODO ask someone what a good size would be here
 pub(crate) fn create_broadcast_shared_secret() -> String {