Steps to Reproduce

1. iceblue https://zkfiddle.org/sample/2ifcqd6/3-listbox-autopaging-flickering
2. breeze https://zkfiddle.org/sample/2ifcqd6/4-listbox-autopaging-flickering-breeze

Current Result

the last 2 items keep showing and disappearing repeatedly
flickering.mov

Expected Result

no flickering

Debug Information

• only happens with custom height
• in the reproducible zul, Listbox is fixed height, because it happens in a specific height. This is what we infer based on the real use case.

Workaround

• <custom-attributes org.zkoss.zul.listbox.autohidePaging="true" />
• remove custom height
• disable autopaging