From 35d95c3044fd2b76bbaa0e3d81e9426acc294ef8 Mon Sep 17 00:00:00 2001
From: Bohdan Triapitsyn <artmore@protonmail.com>
Date: Thu, 7 May 2026 19:24:52 +0300
Subject: [PATCH] fix: allow scrolling during streaming

User scroll-up now unpins active chat streaming
Auto-follow no longer snaps back after trusted upward scrolls
---
 packages/ui/src/hooks/useChatScrollManager.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/ui/src/hooks/useChatScrollManager.ts b/packages/ui/src/hooks/useChatScrollManager.ts
index 6573a845..ab12c151 100644
--- a/packages/ui/src/hooks/useChatScrollManager.ts
+++ b/packages/ui/src/hooks/useChatScrollManager.ts
@@ -375,7 +375,10 @@ export const useChatScrollManager = ({
             return;
         }
 
-        const isProgrammatic = isMarkedAutoScroll(container.scrollTop);
+        const currentScrollTop = container.scrollTop;
+        const scrollingUp = currentScrollTop < lastScrollTopRef.current;
+        const isTrustedScrollUp = Boolean(event?.isTrusted && scrollingUp);
+        const isProgrammatic = !isTrustedScrollUp && isMarkedAutoScroll(currentScrollTop);
         if (isProgrammatic) {
             autoScrollMarkerRef.current = null;
         }
@@ -393,9 +396,6 @@ export const useChatScrollManager = ({
         schedulePinnedStateAndIndicators();
 
         // Handle pin/unpin logic
-        const currentScrollTop = container.scrollTop;
-        const scrollingUp = currentScrollTop < lastScrollTopRef.current;
-
         if (event?.isTrusted && !isProgrammatic) {
             if (scrollingUp && isPinnedRef.current) {
                 setFollowMode('none');