Steps to Reproduce

1. run the zul with 9.5.0.FL.20200714-Eval
the zul is extracted from kanban demo :https://www.zkoss.org/zkdemo/layout/kanban

Current Result

zkmax.layout.wpd:37 Uncaught TypeError: this._redrawpp is not a function
at init.portallayout$mold$ (zkmax.layout.wpd:37)
at init.redraw (zk.wpd:21705)
at init._zkf (zk.wpd:24803)
at init.redraw (zk.wpd:21705)
at init.redraw (zk.wpd:47144)
at init._zkf [as redraw] (zk.wpd:24803)
at init.redrawHTML_ (zk.wpd:22083)
at init.replaceChildHTML_ (zk.wpd:22196)
at init.replaceHTML (zk.wpd:22035)
at mtBL0 (zk.wpd:26083)

Expected Result

renders correctly