From 0908e983fb974fa3c687f983ddf313dd2198a358 Mon Sep 17 00:00:00 2001
From: gongzhiyong <gongzhiyong@gongzhiyongdeMacBook-Air.local>
Date: Wed, 15 Apr 2026 01:18:16 +0800
Subject: [PATCH] =?UTF-8?q?fix(ui):=20P0=20=E7=BA=BF=E7=A8=8B=E5=88=87?=
 =?UTF-8?q?=E6=8D=A2=E6=97=B6=E8=B0=83=E7=94=A8=20switchThread=20=E5=BD=BB?=
 =?UTF-8?q?=E5=BA=95=E6=B8=85=E9=99=A4=20error=20=E7=8A=B6=E6=80=81?=
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useStream 的 error 跨线程持久化，切换 threadId 时不自动重置。
useEffect 监听 currentThreadId 变化，调用 thread.switchThread()
清除 error、messages 等所有旧状态，从根本上解决切换线程后
红色错误横幅残留问题。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 langgraph/src/main.tsx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/langgraph/src/main.tsx b/langgraph/src/main.tsx
index 78d8b81..4e9a398 100644
--- a/langgraph/src/main.tsx
+++ b/langgraph/src/main.tsx
@@ -95,6 +95,11 @@ function App() {
     return () => window.removeEventListener("open-canvas", handler);
   }, []);
 
+  // Clear error and stale stream state when thread switches
+  useEffect(() => {
+    thread.switchThread(currentThreadId);
+  }, [currentThreadId]); // eslint-disable-line react-hooks/exhaustive-deps
+
   // Sync concurrent status with thread loading state
   useEffect(() => {
     if (!thread.isLoading && concurrentStatus !== "cancelling") {