Function docOperation

static/js/codemirror/codemirror.js:1296–1304

(f)

    };
  }
  function docOperation(f) {
    return function() {
      var withOp = this.cm && !this.cm.curOp, result;
      if (withOp) startOperation(this.cm);
      try { result = f.apply(this, arguments); }
      finally { if (withOp) endOperation(this.cm); }
      return result;
    };
  }
  function runInOp(cm, f) {
    var withOp = !cm.curOp, result;
    if (withOp) startOperation(cm);