listbox + frozen column widths resetting when scrolling

Steps to Reproduce

run the attachment column-widths-resetting.zul

1. scroll right left with the horizontal scrollbar
2. increase the browser width (column widths grow to fill new width - OK)
3. scroll right again

Current Result

during step 3: column width reset to initial widths (before increasing browser size)

Expected Result

column width remain stable as when using the frozen scrollbar

Debug Info

potential side effect of ZK-3588

Root Cause

Workaround