test(editor): exercise RAF scroll-restore callback in focus wrapping test

The previous test only verified that requestAnimationFrame was
scheduled but never invoked the callback. Now we capture the RAF
callback, simulate async scroll drift (scrollY changing between
focus call and RAF execution), and verify scrollTo is called to
restore the original position.

Author: tupizz

packages/super-editor/src/core/presentation-editor/tests/PresentationEditor.focusWrapping.test.ts

@@ -356,20 +356,33 @@ describe('PresentationEditor - Focus Wrapping (#wrapHiddenEditorFocus)', () => {
       }).not.toThrow();
     });
 
-    it('schedules requestAnimationFrame as async scroll safety net', () => {
+    it('schedules requestAnimationFrame that restores scroll on async drift', () => {
       editor = new PresentationEditor({
         element: container,
         documentId: 'test-doc',
         pageSize: { w: 612, h: 792 },
       });
 
-      const rafSpy = vi.spyOn(window, 'requestAnimationFrame');
+      // Capture the RAF callback so we can invoke it manually
+      let rafCallback: FrameRequestCallback | null = null;
+      const rafSpy = vi.spyOn(window, 'requestAnimationFrame').mockImplementation((cb) => {
+        rafCallback = cb;
+        return 1;
+      });
+      const scrollToSpy = vi.spyOn(window, 'scrollTo').mockImplementation(() => {});
 
+      // At focus time, scrollX=0 scrollY=0 → captured as beforeX=0 beforeY=0
       editor.editor.view.focus();
 
-      // RAF should be scheduled to catch async browser scroll after focus
       expect(rafSpy).toHaveBeenCalledTimes(1);
-      expect(rafSpy).toHaveBeenCalledWith(expect.any(Function));
+      expect(rafCallback).not.toBeNull();
+
+      // Simulate the browser async-scrolling to the hidden editor (drift from 0 to 500)
+      Object.defineProperty(window, 'scrollY', { value: 500, configurable: true });
+
+      // Run the RAF callback — it should detect drift and restore to beforeY=0
+      rafCallback!(0);
+      expect(scrollToSpy).toHaveBeenCalledWith(0, 0);
     });
 
     it('cancels focus-scroll RAF when scrollToPosition is called', () => {