From 29ceed3a72b2ecb68d234b2e034e9b8f7b370979 Mon Sep 17 00:00:00 2001
From: nesquena-hermes <agent@nesquena-hermes>
Date: Tue, 23 Jun 2026 16:19:50 +0000
Subject: [PATCH] fix(#4778): gate deferred rAF re-restore on still-unpinned
 (Opus gate)

Opus caught a narrow timing race: if a reader re-pins between the scroll-rebuild
guard engaging and its deferred rAF firing, the stale re-restore would yank them
back off the bottom. Gate the re-restore on _messageUserUnpinned at rAF time; the
minHeight release still always runs. Normal single-render unpinned case unaffected.
---
 static/ui.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/static/ui.js b/static/ui.js
index a7b23cef..cedaca31 100644
--- a/static/ui.js
+++ b/static/ui.js
@@ -9682,7 +9682,10 @@ function renderLiveAnchorActivityScene(streamId, scene, opts){
   if(scrollRebuildGuard&&scrollRebuildGuard.release){
     requestAnimationFrame(()=>{
       scrollRebuildGuard.release();
-      _restoreMessageScrollSnapshotSameFrame(scrollSnapshot);
+      // Only re-restore the unpinned snapshot if the reader is STILL unpinned at
+      // rAF time. If they re-pinned between guard-engage and this frame, the
+      // stale re-restore would yank them back off the bottom (Opus gate finding).
+      if(_messageUserUnpinned) _restoreMessageScrollSnapshotSameFrame(scrollSnapshot);
     });
   }
   if(!scrollRebuildGuard.readerAwayFromBottom&&typeof scrollIfPinned==='function') scrollIfPinned();