Take timestamps into account when looking for similar chats

Author: link2xt

src/chat.rs

@@ -1080,6 +1080,8 @@ impl ChatId {
                  JOIN chats_contacts as y
                  WHERE x.contact_id > 9
                    AND y.contact_id > 9
+                   AND x.add_timestamp >= x.remove_timestamp
+                   AND y.add_timestamp >= y.remove_timestamp
                    AND x.chat_id=?
                    AND y.chat_id<>x.chat_id
                    AND y.chat_id>?
@@ -1104,6 +1106,7 @@ impl ChatId {
                 "SELECT chat_id, count(*) AS n
                  FROM chats_contacts
                  WHERE contact_id > ? AND chat_id > ?
+                 AND add_timestamp >= remove_timestamp
                  GROUP BY chat_id",
                 (ContactId::LAST_SPECIAL, DC_CHAT_ID_LAST_SPECIAL),
                 |row| {