From 6a43107bb27d175454c495e9d0cef03fb30ac11f Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Wed, 4 Jun 2025 16:52:44 +0400
Subject: [PATCH] Fix possible crash in subsection tabs.

---
 .../history/view/history_view_subsection_tabs.cpp         | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Telegram/SourceFiles/history/view/history_view_subsection_tabs.cpp b/Telegram/SourceFiles/history/view/history_view_subsection_tabs.cpp
index 5757d7b89e..4d9f888d25 100644
--- a/Telegram/SourceFiles/history/view/history_view_subsection_tabs.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_subsection_tabs.cpp
@@ -341,11 +341,15 @@ void SubsectionTabs::setupSlider(
 				scrollSavingIndex = -1;
 				for (auto index = 0; index != count; ++index) {
 					const auto thread = _sectionsSlice[index].thread;
-					if (ranges::contains(_slice, thread, &Item::thread)) {
+					const auto i = ranges::find(
+						_slice,
+						thread,
+						&Item::thread);
+					if (i != end(_slice)) {
 						scrollSavingThread = thread;
 						scrollSavingShift = scrollValue
 							- slider->lookupSectionPosition(index);
-						scrollSavingIndex = index;
+						scrollSavingIndex = int(i - begin(_slice));
 						break;
 					}
 				}