From 64ca67c0517ae275e20549f16ef4890fb22226cc Mon Sep 17 00:00:00 2001
From: Elaina <elaina@ephron.ren>
Date: Wed, 22 Apr 2026 01:14:13 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E4=BF=AE=E5=A4=8D=20=5Factive=5Ftopic?=
 =?UTF-8?q?=20=E5=9C=A8=E8=AF=9D=E9=A2=98=E5=88=87=E6=8D=A2=E5=90=8E?=
 =?UTF-8?q?=E4=B8=8D=E6=9B=B4=E6=96=B0=E7=9A=84=20bug?=
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问题: _active_topic 只在 continue 时更新，switch 后停留在旧值，导致 overlap 计算失效。

修复:
- select() 每次都更新 _active_topic（无论是否切换）
- 同步调用 topic_gate.update_active_topic() 保持两份状态一致

同时更新 TopicGate 实例的活跃话题状态，解决两份状态独立的问题。
---
 src/gatekeeper.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gatekeeper.py b/src/gatekeeper.py
index 05a8f14..660b19d 100644
--- a/src/gatekeeper.py
+++ b/src/gatekeeper.py
@@ -101,8 +101,10 @@ class ContextGatekeeper:
         # 如需进一步裁剪，可在 Block 内部按句子级别筛选
 
         # 7. 更新活跃话题
-        if not switched and query_anchors:
+        if query_anchors:
             self._active_topic = (query_anchors, self.anchor_extractor._idf_cache)
+        if not switched and query_anchors:
+            self.topic_gate.update_active_topic(query_anchors, self.anchor_extractor._idf_cache)
 
         # 8. 格式化为输出
         result = [