fix: support automatic rtl editor direction

src/hooks/useCodeMirror.test.ts

@@ -42,6 +42,17 @@ describe('useCodeMirror', () => {
     expect(result.current.current?.state.facet(EditorView.cspNonce)).toBe(RUNTIME_STYLE_NONCE)
   })
 
+  it('enables per-line auto text direction for mixed LTR and RTL content', () => {
+    const ref = { current: container }
+    const { result } = renderHook(() =>
+      useCodeMirror(ref, 'English\nمرحبا بالعالم', noopCallbacks),
+    )
+    const view = result.current.current!
+
+    expect(view.state.facet(EditorView.perLineTextDirection)).toBe(true)
+    expect([...container.querySelectorAll('.cm-line')].map(line => line.getAttribute('dir'))).toEqual(['auto', 'auto'])
+  })
+
   it('calls requestMeasure when laputa-zoom-change event fires', () => {
     const ref = { current: container }
     const { result } = renderHook(() =>