Treat member as part of the chat only if add_timestamp >= remove_timestamp

Author: link2xt

src/chat.rs

@@ -2780,7 +2780,9 @@ pub async fn is_contact_in_chat(
     let exists = context
         .sql
         .exists(
-            "SELECT COUNT(*) FROM chats_contacts WHERE chat_id=? AND contact_id=?;",
+            "SELECT COUNT(*) FROM chats_contacts
+             WHERE chat_id=? AND contact_id=?
+             AND add_timestamp >= remove_timestamp",
             (chat_id, contact_id),
         )
         .await?;