Steps to Reproduce

http://zkfiddle.org/sample/e0uidd/1-ZK-4144-another-issue

1. Click "Save"
2. The Groupbox will be opened with many error popups

Current Result

The last error popup is visible, but the corresponding textbox is invisible.

Expected Result

The last error popup should be invisible

Debug Information

If the groupbox is opened first, the issue doesn't happen.

https://github.com/zkoss/zk/blob/v8.6.0.1/zk/src/archive/web/js/zk/au.js#L1498
When a groupbox is opening, au wrongValue didn't wait for it.

Workaround