extract enter processing

need for surveyjs/private-tasks#255

src/question.ts

@@ -2188,6 +2188,12 @@ export class Question extends SurveyElement<Question>
     this.survey.processPopupVisiblityChanged(this, popupModel, visible);
   }
 
+  protected onTextKeyDownHandler(event: any) {
+    if (event.keyCode === 13) {
+      (this.survey as SurveyModel).questionEditFinishCallback(this, event);
+    }
+  }
+
   public transformToMobileView(): void { }
   public transformToDesktopView(): void { }
   public needResponsiveWidth() {
@@ -2324,6 +2330,7 @@ function makeNameValid(str: string): string {
   }
   return str;
 }
+
 Serializer.addClass("question", [
   { name: "!name", onSettingValue: (obj: any, val: any): any => { return makeNameValid(val); } },
   {

src/question_text.ts

@@ -437,12 +437,10 @@ export class QuestionTextModel extends QuestionTextBase {
   };
   public onKeyDown = (event: any) => {
     this.checkForUndo(event);
-    if(this.isInputTextUpdate) {
+    if (this.isInputTextUpdate) {
       this._isWaitingForEnter = event.keyCode === 229;
     }
-    if (event.keyCode === 13) {
-      (this.survey as SurveyModel).questionEditFinishCallback(this, event);
-    }
+    this.onTextKeyDownHandler(event);
   }
   public onChange = (event: any): void => {
     if (event.target === settings.environment.root.activeElement) {

tests/question_texttests.ts

@@ -443,3 +443,7 @@ QUnit.test("Set empty text", function(assert) {
   assert.equal(q.value, " a ", "question.value #6");
   assert.deepEqual(survey.data, { q1: " a " }, "survey.data #6");
 });
+QUnit.test("Text Question KeyHandler exists", function (assert) {
+  const q = new QuestionTextModel("q1");
+  assert.ok(q["onTextKeyDownHandler"], "we need this handler for using in Survey Creator");
+});