set a column's width to 0px doesn't hide a column

Steps to Reproduce

1. run the attached zul and file
2. click a button to hide 5 columns

Current Result

the 5 columns are still visible

Expected Result

the 5 columns are hidden

debug Info

• if you enter edit mode in a cell of those hidden columns, you will find the value is changed:
  

Workaround

• Range.setHidden(true) can hide columns, but has a problem KEIKAI-350