[list] Sort by latest first, not earliest

src/subscription.rs

@@ -181,10 +181,10 @@ impl Subscription {
                         messages
                             .item(i)
                             .and_then(|item| item.downcast::<glib::BoxedAnyObject>().ok())
-                            .map(|b| b.borrow::<models::ReceivedMessage>().time > time)
+                            .map(|b| b.borrow::<models::ReceivedMessage>().time < time)
                             .unwrap_or(false)
                     })
-                    .unwrap_or(messages.n_items() as u32);
+                    .unwrap_or(0);
                 messages.insert(pos, &glib::BoxedAnyObject::new(msg));
                 self.update_unread_count();
             }