fix: milkdown first-change issue

tests/renderer/components/MilkdownEditor.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from 'vitest';
+import { shouldPropagateMilkdownChange } from '../../../src/renderer/components/MilkdownEditor/MilkdownEditor';
+
+describe('shouldPropagateMilkdownChange', () => {
+  it('does not propagate when markdown is unchanged', () => {
+    const result = shouldPropagateMilkdownChange({
+      markdown: 'Same content',
+      prevMarkdown: 'Same content',
+      externalContent: 'Same content',
+      hasUserInteracted: true,
+    });
+
+    expect(result).toBe(false);
+  });
+
+  it('does not propagate normalization changes without user interaction', () => {
+    const result = shouldPropagateMilkdownChange({
+      markdown: 'Line one\n\nLine two',
+      prevMarkdown: '',
+      externalContent: 'Line one\nLine two',
+      hasUserInteracted: false,
+    });
+
+    expect(result).toBe(false);
+  });
+
+  it('propagates real edits when user has interacted', () => {
+    const result = shouldPropagateMilkdownChange({
+      markdown: '[Example](https://example.com)',
+      prevMarkdown: 'Hello world',
+      externalContent: 'Hello world',
+      hasUserInteracted: true,
+    });
+
+    expect(result).toBe(true);
+  });
+
+  it('does not propagate duplicate updates that match external content', () => {
+    const result = shouldPropagateMilkdownChange({
+      markdown: 'External content',
+      prevMarkdown: 'Different previous',
+      externalContent: 'External content',
+      hasUserInteracted: true,
+    });
+
+    expect(result).toBe(false);
+  });
+});