From ad7d515d50a825df656daeac5c2b4c1de9c1cc4a Mon Sep 17 00:00:00 2001
From: Brendan Allan <14191578+Brendonovich@users.noreply.github.com>
Date: Sun, 23 Aug 2026 23:43:17 +0800
Subject: [PATCH] fix(session-ui): avoid replaying thinking summary animation
 (#44440)

---
 packages/session-ui/src/timeline/session-timeline-row.tsx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/session-ui/src/timeline/session-timeline-row.tsx b/packages/session-ui/src/timeline/session-timeline-row.tsx
index 6078902a1d7..f177b8e2fd2 100644
--- a/packages/session-ui/src/timeline/session-timeline-row.tsx
+++ b/packages/session-ui/src/timeline/session-timeline-row.tsx
@@ -458,6 +458,7 @@ export function createSessionTimelineRowRenderer(input: {
         if (value._tag !== "Thinking") throw new Error("Expected a thinking timeline row")
         return value
       }
+      const animateHeading = createMemo<boolean>((previous) => previous ?? !current().reasoningHeading)
       return (
         <Frame row={current()}>
           <div data-slot="session-turn-message-container" class={`w-full ${padding()}`}>
@@ -480,8 +481,8 @@ export function createSessionTimelineRowRenderer(input: {
                             <TextReveal
                               text={current().reasoningHeading}
                               class="session-turn-thinking-heading"
-                              travel={25}
-                              duration={700}
+                              travel={animateHeading() ? 25 : 0}
+                              duration={animateHeading() ? 700 : 0}
                             />
                           </span>
                         </Show>