Update the view when a header moves
function(headerCt, header, colsToMove, fromIdx, toIdx) {
        var me = this;

        // If there are Features or Plugins which create DOM which must match column order, they set the optimizedColumnMove flag to false.
        // In this case we must refresh the view on column move.
        if (me.optimizedColumnMove === false) {
            me.view.refresh();
        }

        // Simplest case for default DOM structure is just to swap the columns round in the view.
        else {
            me.view.moveColumn(fromIdx, toIdx, colsToMove);
        }
        me.delayScroll();
    }