chat: Make tdlib delete messages from our own cache

We finally handle chat opening/closing and we also track visible
messages, so this should be enough for a complete correct message cache
management.

src/tdlib/chat.rs

@@ -264,20 +264,16 @@ impl Chat {
                 self.set_unread_mention_count(update.unread_mention_count)
             }
             DeleteMessages(data) => {
-                // FIXME: This should be removed after we notify opened and closed chats to TDLib
-                // See discussion here: https://t.me/tdlibchat/65304
-                if !data.from_cache {
-                    let mut messages = imp.messages.borrow_mut();
-                    let deleted_messages: Vec<Message> = data
-                        .message_ids
-                        .into_iter()
-                        .filter_map(|id| messages.remove(&id))
-                        .collect();
-
-                    drop(messages);
-                    for message in deleted_messages {
-                        self.emit_by_name::<()>("deleted-message", &[&message]);
-                    }
+                let mut messages = imp.messages.borrow_mut();
+                let deleted_messages: Vec<Message> = data
+                    .message_ids
+                    .into_iter()
+                    .filter_map(|id| messages.remove(&id))
+                    .collect();
+
+                drop(messages);
+                for message in deleted_messages {
+                    self.emit_by_name::<()>("deleted-message", &[&message]);
                 }
             }
             MessageContent(ref data) => {