mobile: repeat group invitations don't duplicate chat preview (#1310)

apps/android/app/src/main/java/chat/simplex/app/model/SimpleXAPI.kt

@@ -1035,7 +1035,7 @@ open class ChatController(var ctrl: ChatCtrl?, val ntfManager: NtfManager, val a
         }
       }
       is CR.ReceivedGroupInvitation -> {
-        chatModel.addChat(Chat(chatInfo = ChatInfo.Group(r.groupInfo), chatItems = listOf()))
+        chatModel.updateGroup(r.groupInfo) // update so that repeat group invitations are not duplicated
         // TODO NtfManager.shared.notifyGroupInvitation
       }
       is CR.UserAcceptedGroupSent -> {

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -986,10 +986,7 @@ func processReceivedMsg(_ res: ChatResponse) async {
                 _ = m.upsertChatItem(cInfo, cItem)
             }
         case let .receivedGroupInvitation(groupInfo, _, _):
-            m.addChat(Chat(
-                chatInfo: .group(groupInfo: groupInfo),
-                chatItems: []
-            ))
+            m.updateGroup(groupInfo) // update so that repeat group invitations are not duplicated
             // NtfManager.shared.notifyContactRequest(contactRequest) // TODO notifyGroupInvitation?
         case let .userAcceptedGroupSent(groupInfo, hostContact):
             m.updateGroup(groupInfo)