message: Fix question's title class updating in knockout. Fix for
diff: @@ -78,7 +78,7 @@ export class QuestionImplementor extends ImplementorBase {
  (question.hasTitleOnLeft ? " " + question.koCss().contentLeft : "")
  );
  });
  - (<any>this.question)["koTitleClass"] = ko.computed(function() {
  + (<any>this.question)["koTitleClass"] = ko.pureComputed(function() {
  var question = self.question;
  var cssClasses = question.cssClasses;
  var result = cssClasses.title;
  @@ -89,7 +89,7 @@ export class QuestionImplementor extends ImplementorBase {
  }
  return result;
  });
  - (<any>this.question)["koErrorClass"] = ko.computed(function() {
  + (<any>this.question)["koErrorClass"] = ko.pureComputed(function() {
  var question = self.question;
  var classes = question.cssClasses.error.root;
  if (question.errorLocation == "top") {
  