From 63a3d64e2f3ef8e377f20bdab88e705b3bb611c9 Mon Sep 17 00:00:00 2001
From: Daniel <845765@qq.com>
Date: Thu, 13 Nov 2025 12:19:06 +0800
Subject: [PATCH] :art: Improve HTML underline style clipping
 https://github.com/siyuan-note/siyuan/issues/14804

Signed-off-by: Daniel <845765@qq.com>
---
 app/src/protyle/util/paste.ts | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/app/src/protyle/util/paste.ts b/app/src/protyle/util/paste.ts
index 6c880f888..90b137da3 100644
--- a/app/src/protyle/util/paste.ts
+++ b/app/src/protyle/util/paste.ts
@@ -470,8 +470,21 @@ export const paste = async (protyle: IProtyle, event: (ClipboardEvent | DragEven
                 isHTML = true;
             }
 
+            // 判断是否包含多个换行，包含多个换行则很有可能是纯文本（豆包复制粘贴问题，纯文本外面会包裹一个 HTML 标签，但内部是 Markdown 纯文本）
+            let containsNewlines = false;
+            const tempDiv = document.createElement("div");
+            tempDiv.innerHTML = textHTML;
+            const walker = document.createTreeWalker(tempDiv, NodeFilter.SHOW_TEXT, null);
+            let node;
+            while (node = walker.nextNode()) {
+                if (node.nodeValue && (node.nodeValue.match(/\n/g) || []).length >= 2) {
+                    containsNewlines = true;
+                    break;
+                }
+            }
+
             const textHTMLLowercase = textHTML.toLowerCase();
-            if (textPlain && "" !== textPlain.trim() && (textHTML.startsWith("<span") || textHTML.startsWith("<br")) &&
+            if (textPlain && "" !== textPlain.trim() && (textHTML.startsWith("<span") || textHTML.startsWith("<br")) && containsNewlines &&
                 (0 > textHTMLLowercase.indexOf("class=\"katex") && 0 > textHTMLLowercase.indexOf("class=\"math") &&
                     0 > textHTMLLowercase.indexOf("</a>") && 0 > textHTMLLowercase.indexOf("</img>") && 0 > textHTMLLowercase.indexOf("</code>") &&
                     0 > textHTMLLowercase.indexOf("</b>") && 0 > textHTMLLowercase.indexOf("</strong>") &&
@@ -488,9 +501,6 @@ export const paste = async (protyle: IProtyle, event: (ClipboardEvent | DragEven
         if (isHTML) {
             const tempElement = document.createElement("div");
             tempElement.innerHTML = textHTML;
-            tempElement.querySelectorAll("[style]").forEach((e) => {
-                e.removeAttribute("style");
-            });
             // 移除空的 A 标签
             tempElement.querySelectorAll("a").forEach((e) => {
                 if (e.innerHTML.trim() === "") {