Function addClass

GUI/codemirror/lib/codemirror.js:7131–7133

(node, cls)

    if (test.test(node.className)) node.className = node.className.replace(test, "");
  }
  function addClass(node, cls) {
    if (!classTest(cls).test(node.className)) node.className += " " + cls;
  }
  function joinClasses(a, b) {
    var as = a.split(" ");
    for (var i = 0; i < as.length; i++)