perf: 体验优化，现在末尾空行不再视为已改动

Author: LarryZhu-dev

src/renderer/components/editor/MilkupEditor.vue

@@ -21,6 +21,7 @@ import { useAIConfig } from "@/renderer/hooks/useAIConfig";
 import { useConfig } from "@/renderer/hooks/useConfig";
 import emitter from "@/renderer/events";
 import "@/core/styles/milkup.css";
+import { normalizeMarkdownForDirtyCheck } from "@/renderer/utils/markdown";
 
 interface Props {
   tab: Tab;
@@ -195,7 +196,9 @@ function createEditorInstance() {
       return;
     }
 
-    tab.isModified = restoredMarkdown !== tab.originalContent;
+    tab.isModified =
+      normalizeMarkdownForDirtyCheck(restoredMarkdown) !==
+      normalizeMarkdownForDirtyCheck(tab.originalContent);
     emitOutlineUpdate();
   });
 

src/renderer/hooks/useTab.ts

@@ -7,6 +7,7 @@ import { setCurrentMarkdownFilePath } from "@/plugins/imagePathPlugin";
 import emitter from "@/renderer/events";
 import { createTabDataFromFile, readAndProcessFile } from "@/renderer/services/fileService";
 import { createInertiaScroll } from "@/renderer/utils/inertiaScroll";
+import { normalizeMarkdownForDirtyCheck } from "@/renderer/utils/markdown";
 import { randomUUID } from "@/renderer/utils/tool";
 import { isShowOutline } from "./useOutline";
 import { useConfig } from "./useConfig";
@@ -168,7 +169,6 @@ function updateCurrentTabContent(content: string, isModified?: boolean) {
   const currentTab = getCurrentTab();
   if (!currentTab) return;
 
-  const prevContent = currentTab.content;
   currentTab.content = content;
 
   if (currentTab.readOnly) {
@@ -190,8 +190,9 @@ function updateCurrentTabContent(content: string, isModified?: boolean) {
     return;
   }
 
-  // 简单比较：当前内容 vs 原始内容
-  currentTab.isModified = content !== currentTab.originalContent;
+  currentTab.isModified =
+    normalizeMarkdownForDirtyCheck(content) !==
+    normalizeMarkdownForDirtyCheck(currentTab.originalContent);
 }
 
 // 更新当前tab的文件信息（用于文件覆盖场景）

src/renderer/utils/markdown.ts

@@ -0,0 +1,3 @@
+export function normalizeMarkdownForDirtyCheck(content: string): string {
+  return content.replace(/(?:\r?\n(?:[ \t]*\r?\n)*)[ \t]*$/u, "");
+}