message: Change trigger serialization,
diff: @@ -129,7 +129,7 @@ export class Trigger extends Base {
  this.usedNames = [];
  this.conditionRunner = null;
  }
  - private buildExpression(): string {
  + public buildExpression(): string {
  if (!this.name) return "";
  if (Helpers.isValueEmpty(this.value) && this.isRequireValue) return "";
  return (
  @@ -257,11 +257,11 @@ export class SurveyTriggerSetValue extends SurveyTrigger {
  }
  JsonObject.metaData.addClass("trigger", [
  - "operator",
  + {name: "operator", default: "equal"},
  "value",
  "expression:condition"
  ]);
  -JsonObject.metaData.addClass("surveytrigger", ["!name"], null, "trigger");
  +JsonObject.metaData.addClass("surveytrigger", ["name"], null, "trigger");
  JsonObject.metaData.addClass(
  "visibletrigger",
  ["pages", "questions"],
  