From 671e708bb5936130ebb6d7ee7675abf00bdca1c6 Mon Sep 17 00:00:00 2001
From: gongzhiyong <gongzhiyong@gongzhiyongdeMacBook-Air.local>
Date: Wed, 15 Apr 2026 01:05:14 +0800
Subject: [PATCH] =?UTF-8?q?fix(ui):=20P0=20=E5=88=87=E6=8D=A2=E7=A9=BA?=
 =?UTF-8?q?=E7=BA=BF=E7=A8=8B=E4=B8=8D=E6=98=BE=E7=A4=BA=E9=94=99=E8=AF=AF?=
 =?UTF-8?q?=E6=A8=AA=E5=B9=85?=
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thread.error 在 useStream 切换 threadId 时不会自动清除，
导致切换到空新对话时残留旧线程的 error 触发红色错误横幅。
修复：activeMessages.length === 0 时抑制错误横幅，
空线程不可能有工具执行异常，无需展示该提示。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 langgraph/src/components/ChatMessages.tsx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/langgraph/src/components/ChatMessages.tsx b/langgraph/src/components/ChatMessages.tsx
index 3956b64..72686d4 100644
--- a/langgraph/src/components/ChatMessages.tsx
+++ b/langgraph/src/components/ChatMessages.tsx
@@ -435,8 +435,8 @@ export function ChatMessages({
           ));
         })()}
 
-      {/* Thread error banner */}
-      {!!thread.error && !thread.isLoading && (
+      {/* Thread error banner — only show when there are messages (suppress stale error on empty thread switch) */}
+      {!!thread.error && !thread.isLoading && activeMessages.length > 0 && (
         <div className="rounded-xl border border-red-300 dark:border-red-800 bg-red-50 dark:bg-red-950/30 px-4 py-4 flex flex-col gap-3 my-2">
           <div className="flex items-start gap-2.5">
             <AlertTriangle className="size-4 shrink-0 text-red-500 dark:text-red-400 mt-0.5" />