From db77165dada47f6fe093668f95cc73ecdfeace7f Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Sat, 16 Jan 2021 03:14:15 +0300
Subject: [PATCH] Optimize ContactsManager::search_among_users.

---
 td/telegram/ContactsManager.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index aff32aa7a..e095dde17 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -13370,7 +13370,11 @@ std::pair<int32, vector<UserId>> ContactsManager::search_among_users(const vecto
     if (u == nullptr) {
       continue;
     }
-    hints.add(user_id.get(), u->first_name + " " + u->last_name + " " + u->username);
+    if (query.empty()) {
+      hints.add(user_id.get(), Slice(" "));
+    } else {
+      hints.add(user_id.get(), PSLICE() << u->first_name << ' ' << u->last_name << ' ' << u->username);
+    }
     hints.set_rating(user_id.get(), -get_user_was_online(u, user_id));
   }