Grid renders its column width incorrectly with span=true

    zk.afterLoad('zul.grid', function () {
        var xColumn = {};
        zk.override(zul.grid.Column.prototype, xColumn, {
            afterParentChanged_: function () {
                xColumn.afterParentChanged_.apply(this, arguments);
                zWatch.listen({
                    onCommandReady: this
                });
            },
            onCommandReady: function () {
                this.clearCachedSize_();
                zUtl.fireSized(this);
                zWatch.unlisten({
                    onCommandReady: this
                });
            }
        });
    });