android: keep read ack strictly bounded by visible incoming messages

android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatViewModel.kt

@@ -656,7 +656,6 @@ class ChatViewModel @Inject constructor(
     }
 
     private fun acknowledgeLatestMessages(messages: List<MessageItem>) {
-        val latestVisible = messages.maxByOrNull { it.id } ?: return
         val latestIncoming = messages.asReversed().firstOrNull { !it.isOutgoing }
 
         if (latestIncoming != null && lastDeliveredMessageId != latestIncoming.id) {
@@ -665,9 +664,6 @@ class ChatViewModel @Inject constructor(
                 markMessageDeliveredUseCase(chatId = chatId, messageId = latestIncoming.id)
             }
         }
-        if ((lastReadMessageId ?: 0L) < latestVisible.id) {
-            lastReadMessageId = latestVisible.id
-        }
     }
 
     fun canEdit(message: MessageItem): Boolean {