From 1d352cf62032c70616f8630be17939e805eefaee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=90=B4=E5=AE=9C=E6=B3=A2?= <760478279@qq.com>
Date: Wed, 16 Jul 2025 10:48:14 +0800
Subject: [PATCH] =?UTF-8?q?fix(BubbleList):=20=20=E6=BB=9A=E5=8A=A8?=
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---
 packages/core/src/components/BubbleList/index.vue | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/core/src/components/BubbleList/index.vue b/packages/core/src/components/BubbleList/index.vue
index 0f319a30..ad9647ca 100644
--- a/packages/core/src/components/BubbleList/index.vue
+++ b/packages/core/src/components/BubbleList/index.vue
@@ -175,6 +175,12 @@ function handleScroll() {
     showBackToBottom.value =
       props.showBackButton && distanceToBottom > props.backButtonThreshold;
 
+    // 处理 lastScrollTop.value 安全距离(scrollHeight 在滚动过程中变小)
+    const maxScrollTop = scrollHeight - clientHeight;
+    if (lastScrollTop.value > maxScrollTop) {
+      lastScrollTop.value = maxScrollTop;
+    }
+
     // 判断是否距离底部小于阈值 (这里吸附值大一些会体验更好)
     const isCloseToBottom = scrollTop + clientHeight >= scrollHeight - 30;
     // 判断用户是否向上滚动