From 597d2694c087f725a518d7c404b101ee648c9838 Mon Sep 17 00:00:00 2001
From: "thuchenyusi@qq.com" <thuchenyusi@qq.com>
Date: Fri, 9 Oct 2026 19:19:47 +0800
Subject: [PATCH] Improve chapter sidebar toggle experience

---
 index.html | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/index.html b/index.html
index 684f02deb..ecf03bf4f 100644
--- a/index.html
+++ b/index.html
@@ -1002,7 +1002,7 @@ <h1>高性价比人生指南</h1>
 const TOC_MAN = new Map();
 // 选了节就展开那一节；看全部章节时跟着 spy 展开正在读的那节，读到页首就全收起。
 // 高亮行滚出侧栏可视区时把侧栏拉过去，只动侧栏自己的 scrollTop，不碰页面滚动。
-function tocSync(hit){
+function tocSync(hit, { follow = true } = {}){
   const selk = [...state.sec].join();
   if (selk !== TOC_SELK){ TOC_MAN.clear(); TOC_SELK = selk; }
   const open = state.sec.size ? [...state.sec][0] : (hit ? hit.split('-')[1] : '');
@@ -1015,7 +1015,7 @@ <h1>高性价比人生指南</h1>
   TOC_ON = TOC.get(hit) || null;
   if (!TOC_ON) return;
   TOC_ON.classList.add('on');
-  if (!TOC_ON.offsetParent) return;        // 被筛掉或所在节收起了，量不出位置
+  if (!follow || !TOC_ON.offsetParent) return; // 手动折叠不追踪滚动；隐藏的条目量不出位置
   const sb = document.getElementById('sidebar');
   const r = TOC_ON.getBoundingClientRect(), br = sb.getBoundingClientRect();
   if (r.top < br.top + 48 || r.bottom > br.bottom - 48) sb.scrollTop += r.top - br.top - sb.clientHeight / 3;
@@ -1208,7 +1208,7 @@ <h1>高性价比人生指南</h1>
     // 点折叠箭头，或再点一次已选中的节：只收起或展开这节的目录，筛选不动
     if (dim === 'sec' && v && (ev.target.closest('.fold') || set.has(v))){
       const sub = TOC_SEC.get(v);
-      TOC_MAN.set(v, sub.hidden); tocSync(spyLast);
+      TOC_MAN.set(v, sub.hidden); tocSync(spyLast, { follow: false });
       return;
     }
     if (dim === 'sec'){