Fix bad refresh

src/controllers/conversations_controller.rs

@@ -216,11 +216,11 @@ pub fn refresh_single(r: &mut HttpRequestHandler) -> RequestResult {
 
     messages.sort_by(|one, two| one.id.cmp(&two.id));
 
-    if messages.len() > 0 {
+    if messages.len() > 0 && messages.last().unwrap().id > conv.last_message_seen {
         conversations_helper::mark_user_seen(
             conv.conv_id,
             r.user_id_ref()?,
-            &messages[messages.len() - 1],
+            &messages.last().unwrap(),
         )?;
     }