From 4fb25576b90879d4285520c83cc34a336ab9be87 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 7 Apr 2026 22:17:51 +0000
Subject: [PATCH] fix: defer markThreadVisited to avoid React 185 error

Wraps `markThreadVisited` in `startTransition` inside `ChatView.tsx` to defer the Zustand update out of React's synchronous commit cycle. This prevents an infinite re-render loop ("Maximum update depth exceeded") in React 19 caused by synchronous state updates from within the `useEffect`.

Co-authored-by: gleber <33185+gleber@users.noreply.github.com>
---
 apps/web/src/components/ChatView.tsx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 7c649b5003..3d8c3794f5 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -23,7 +23,7 @@ import {
 import { applyClaudePromptEffortPrefix, normalizeModelSlug } from "@t3tools/shared/model";
 import { projectScriptCwd, projectScriptRuntimeEnv } from "@t3tools/shared/projectScripts";
 import { truncate } from "@t3tools/shared/String";
-import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
+import { startTransition, useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { useDebouncedValue } from "@tanstack/react-pacer";
 import { useNavigate, useSearch } from "@tanstack/react-router";
@@ -976,7 +976,9 @@ export default function ChatView({ threadId }: ChatViewProps) {
     const lastVisitedAt = activeThreadLastVisitedAt ? Date.parse(activeThreadLastVisitedAt) : NaN;
     if (!Number.isNaN(lastVisitedAt) && lastVisitedAt >= turnCompletedAt) return;
 
-    markThreadVisited(serverThread.id);
+    startTransition(() => {
+      markThreadVisited(serverThread.id);
+    });
   }, [
     activeLatestTurn?.completedAt,
     activeThreadLastVisitedAt,