fix: correct stack offset calculation in useListPosition

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: zombieJ

src/hooks/useListPosition/index.ts

@@ -18,11 +18,12 @@ export default function useListPosition(configList: { key: React.Key }[], stack?
       const key = String(config.key);
       const nodePosition = {
         x: 0,
-        y: stack ? offsetY + (stack.offset ?? 0) : offsetY,
+        y: offsetY,
       };
 
       nextNotificationPosition.set(key, nodePosition);
-      offsetY += sizeMap[key]?.height ?? 0;
+      // offsetY += (sizeMap[key]?.height ?? 0) + (stack?.offset ?? 0);
+      offsetY += (stack ? stack.offset : sizeMap[key]?.height) ?? 0;
     });
 
     return nextNotificationPosition;

tests/stack.test.tsx

@@ -113,12 +113,16 @@ describe('stack', () => {
       fireEvent.click(container.querySelector('button'));
     }
 
-    const [firstNotice] = document.querySelectorAll<HTMLElement>('.rc-notification-notice');
+    const notices = Array.from(document.querySelectorAll<HTMLElement>('.rc-notification-notice'));
+    const offsetList = notices.map((notice) => notice.style.getPropertyValue('--notification-y'));
 
-    expect(firstNotice.style.getPropertyValue('--notification-y')).toBe('12px');
+    expect(offsetList).toContain('0px');
+    expect(offsetList).toContain('12px');
 
     fireEvent.mouseEnter(document.querySelector('.rc-notification-list'));
 
-    expect(firstNotice.style.getPropertyValue('--notification-y')).toBe('0px');
+    expect(
+      notices.every((notice) => notice.style.getPropertyValue('--notification-y') === '0px'),
+    ).toBeTruthy();
   });
 });