fix(editor): suppress ambiguous Unicode highlights in Markdown (#36009)

src/renderer/src/components/editor/MonacoEditor.system-theme.test.tsx

@@ -144,3 +144,34 @@ describe('MonacoEditor system theme', () => {
     expect(editorProps.current?.theme).toBe('vs')
   })
 })
+
+it('updates Unicode highlighting when the editor language changes', () => {
+  installMatchMedia(false)
+  const props = {
+    fileId: 'file',
+    filePath: '/repo/file.md',
+    viewStateKey: 'pane:file',
+    relativePath: 'file.md',
+    content: '中文说明：（ example ）\u200b',
+    onContentChange: vi.fn(),
+    onSave: vi.fn()
+  }
+  const view = render(<MonacoEditor {...props} language="markdown" />)
+  expect(editorProps.current?.options).toEqual(
+    expect.objectContaining({
+      unicodeHighlight: { ambiguousCharacters: false, invisibleCharacters: true }
+    })
+  )
+  view.rerender(<MonacoEditor {...props} language="typescript" />)
+  expect(editorProps.current?.options).toEqual(
+    expect.objectContaining({
+      unicodeHighlight: { ambiguousCharacters: true, invisibleCharacters: true }
+    })
+  )
+  view.rerender(<MonacoEditor {...props} language="markdown" />)
+  expect(editorProps.current?.options).toEqual(
+    expect.objectContaining({
+      unicodeHighlight: { ambiguousCharacters: false, invisibleCharacters: true }
+    })
+  )
+})

src/renderer/src/components/editor/MonacoEditor.tsx

@@ -306,6 +306,10 @@ export default function MonacoEditor({
           lineNumbers: 'on',
           renderLineHighlight: 'line',
           automaticLayout: true,
+          unicodeHighlight: {
+            ambiguousCharacters: language !== 'markdown',
+            invisibleCharacters: true
+          },
           tabSize: 2,
           readOnly,
           scrollbar: autoHeight