function resetEditorDiv(el) {
            el.attr("class").split(/\s+/).forEach(function(cls) {
                if (cls.substring(0, "editor-".length) === "editor-") {
                    el.removeClass(cls);
                }
            });
            return el;
        }
Triggered when the split configuration has changed
@param config (1, 2, 3 or preview)