message: Use question.isVisible for knockout
  (show always for design-time)
diff: @@ -8,7 +8,7 @@ export class QuestionImplementorBase {
  question.visibilityChangedCallback = function () { self.onVisibilityChanged(); };
  question.renderWidthChangedCallback = function () { self.onRenderWidthChanged(); };
  this.koTemplateName = ko.pureComputed(function () { return self.getTemplateName(); });
  - this.koVisible = ko.observable(this.question.visible);
  + this.koVisible = ko.observable(this.question.isVisible);
  this.koRenderWidth = ko.observable(this.question.renderWidth);
  this.koErrors = ko.observableArray();
  this.koMarginLeft = ko.pureComputed(function () { self.koRenderWidth(); return self.getIndentSize(self.question.indent); });
  @@ -23,7 +23,7 @@ export class QuestionImplementorBase {
  }
  protected updateQuestion() { }
  protected onVisibilityChanged() {
  - this.koVisible(this.question.visible);
  + this.koVisible(this.question.isVisible);
  }
  protected onRenderWidthChanged() {
  this.koRenderWidth(this.question.renderWidth);
  