Steps to Reproduce

Run fiddle:
http://zkfiddle.org/sample/tj8bv6/4-Grid-850-colunm-hidden

Current Result

In ZK 8.0.5
Visible="false" column is hidden.
Grid body <colgroup> <col> element receives style="display:none"
Each cell in the column also receive style="display:none"

In ZK 8.5.0
Visible="false" column header is hidden, but content (row cells) is not hidden.
Grid body <colgroup> <col> element receives style="width:0px" (chrome doesn't parse width:0px well)

Expected Result

Grid body <col> should be hidden (either display none or width:0.1px)

Debug Info

https://github.com/zkoss/zk/blame/072daeafd9d60997b65889fd3ae0dc562c9e1076/zul/src/archive/web/js/zul/mesh/MeshWidget.js#L1315

Root Cause

Changes to Meshwidget in https://github.com/zkoss/zk/commit/a9d091ed356824be23c86e69261fbf4b7796e183
Beforehand:
Both the <col> and the <td> elements used by this column would receive "display:none".

Workaround