Function operation

static/js/codemirror/codemirror.js:1287–1295

(cm1, f)

  // Wraps a function in an operation. Returns the wrapped function.
  function operation(cm1, f) {
    return function() {
      var cm = cm1 || this, withOp = !cm.curOp;
      if (withOp) startOperation(cm);
      try { var result = f.apply(cm, arguments); }
      finally { if (withOp) endOperation(cm); }
      return result;
    };
  }
  function docOperation(f) {
    return function() {
      var withOp = this.cm && !this.cm.curOp, result;