test: add milkdown markdown roundtrip integration coverage

Co-authored-by: rfc1437 <774975+rfc1437@users.noreply.github.com>

src/renderer/components/MilkdownEditor/MilkdownEditor.tsx

@@ -22,7 +22,7 @@ import { imageResolverPlugin } from '../../plugins/imageResolverPlugin';
 import '../../macros';
 import './MilkdownEditor.css';
 import { InsertModal } from '../InsertModal';
-import { unescapeMacroSyntax } from '../../utils/markdownEscape';
+import { normalizeMilkdownMarkdown } from '../../utils/markdownEscape';
 
 // Remark plugin to force tight lists (no blank lines between list items)
 const remarkTightListsPlugin: Plugin<[Record<string, unknown>], Root> = () => {
@@ -68,11 +68,11 @@ export const shouldPropagateMilkdownChange = ({
   externalContent,
   hasUserInteracted,
 }: MilkdownChangePropagationInput): boolean => {
-  const unescaped = unescapeMacroSyntax(markdown);
-  const prevUnescaped = unescapeMacroSyntax(prevMarkdown);
-  const externalUnescaped = unescapeMacroSyntax(externalContent);
+  const normalized = normalizeMilkdownMarkdown(markdown);
+  const prevNormalized = normalizeMilkdownMarkdown(prevMarkdown);
+  const externalNormalized = normalizeMilkdownMarkdown(externalContent);
 
-  if (unescaped === prevUnescaped) {
+  if (normalized === prevNormalized) {
     return false;
   }
 
@@ -80,7 +80,7 @@ export const shouldPropagateMilkdownChange = ({
     return false;
   }
 
-  return unescaped !== externalUnescaped;
+  return normalized !== externalNormalized;
 };
 
 interface EditorToolbarProps {
@@ -329,7 +329,7 @@ const MilkdownProviderInner: React.FC<MilkdownEditorProps> = ({
 
           if (shouldEmit) {
             isInternalChange.current = true;
-            onChangeRef.current(unescapeMacroSyntax(markdown));
+            onChangeRef.current(normalizeMilkdownMarkdown(markdown));
           }
         });
       })

src/renderer/utils/markdownEscape.ts

@@ -37,3 +37,37 @@ export function unescapeMacroSyntax(markdown: string): string {
   
   return result;
 }
+
+const unorderedListItemPattern = /^\s{0,3}[-+*]\s/;
+const orderedListItemPattern = /^\s{0,3}\d+\.\s/;
+
+function getListLineType(line: string): 'ordered' | 'unordered' | null {
+  if (unorderedListItemPattern.test(line)) return 'unordered';
+  if (orderedListItemPattern.test(line)) return 'ordered';
+  return null;
+}
+
+export function normalizeMilkdownMarkdown(markdown: string): string {
+  const unescaped = unescapeMacroSyntax(markdown);
+  const lines = unescaped.split('\n');
+  const normalized: string[] = [];
+
+  for (let i = 0; i < lines.length; i += 1) {
+    const line = lines[i];
+
+    const previousListType = i > 0 ? getListLineType(lines[i - 1]) : null;
+    const nextListType = i < lines.length - 1 ? getListLineType(lines[i + 1]) : null;
+    if (line === '' && previousListType !== null && previousListType === nextListType) {
+      continue;
+    }
+
+    if (line === '>') {
+      normalized.push('> ');
+      continue;
+    }
+
+    normalized.push(line);
+  }
+
+  return normalized.join('\n');
+}