From 191aee752fbca19a1c53371f85ef303368513995 Mon Sep 17 00:00:00 2001
From: Andrew Telnov <andrew.telnov@gmail.com>
Date: Tue, 5 Sep 2023 14:33:37 +0300
Subject: [PATCH] Fix issue with has default value for localization strings

---
 src/base.ts                       |  2 ++
 src/localizablestring.ts          |  2 +-
 tests/basetests.ts                | 16 ++++++++++++++--
 tests/surveyserializationtests.ts |  4 ++++
 4 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/base.ts b/src/base.ts
index 852280c7ea..bf88876b11 100644
--- a/src/base.ts
+++ b/src/base.ts
@@ -485,6 +485,8 @@ export class Base {
     if(!prop || prop.isCustom && this.isCreating) return undefined;
     const dValue = prop.defaultValue;
     if (!this.isPropertyEmpty(dValue) && !Array.isArray(dValue)) return dValue;
+    const locStr = this.localizableStrings ? this.localizableStrings[name] : undefined;
+    if(locStr && locStr.localizationName) return this.getLocalizationString(locStr.localizationName);
     if (prop.type == "boolean" || prop.type == "switch") return false;
     if (prop.isCustom && !!prop.onGetValue) return prop.onGetValue(this);
     return undefined;
diff --git a/src/localizablestring.ts b/src/localizablestring.ts
index c394b05fc5..21e62c65e8 100644
--- a/src/localizablestring.ts
+++ b/src/localizablestring.ts
@@ -199,7 +199,7 @@ export class LocalizableString implements ILocalizableString {
     var oldValue = this.onStrChanged && loc === curLoc ? this.pureText : undefined;
     delete (<any>this).htmlValues[loc];
     if (this.isValueEmpty(value)) {
-      if (this.getValue(loc)) this.deleteValue(loc);
+      this.deleteValue(loc);
     } else {
       if (typeof value === "string") {
         if (this.canRemoveLocValue(loc, value)) {
diff --git a/tests/basetests.ts b/tests/basetests.ts
index 158e4ff3a7..13ca512998 100644
--- a/tests/basetests.ts
+++ b/tests/basetests.ts
@@ -5,7 +5,7 @@ import { property, Serializer } from "../src/jsonobject";
 import { SurveyModel } from "../src/survey";
 import { Action } from "../src/actions/action";
 import { findParentByClassNames } from "../src/utils/utils";
-import { QuestionTextModel } from "../src/question_text";
+import { QuestionDropdownModel } from "../src/question_dropdown";
 
 export default QUnit.module("Base");
 
@@ -736,7 +736,7 @@ QUnit.test("Subscribe localizable property", function (assert) {
   assert.equal(updaterCallCount1, 2, "update called - localizable value");
 });
 QUnit.test("base.hasDefaultPropertyValue, base.getDefaultPropertyValue and base.resetPropertyValue()", function (assert) {
-  const question = new QuestionTextModel("q1");
+  const question = new QuestionDropdownModel("q1");
   assert.equal(question.hasDefaultPropertyValue("width"), false, "question.width has no default value");
   assert.notOk(question.getDefaultPropertyValue("width"), "question.width default value is undefined");
   question.width = "200px";
@@ -753,6 +753,18 @@ QUnit.test("base.hasDefaultPropertyValue, base.getDefaultPropertyValue and base.
   assert.strictEqual(question.minWidth, "", "minWidth property value is empty string");
   question.resetPropertyValue("minWidth");
   assert.equal(question.minWidth, "300px", "minWidth property value is reset, #2");
+
+  assert.equal(question.hasDefaultPropertyValue("placeholder"), true, "question.placeholder has default value");
+  assert.equal(question.getDefaultPropertyValue("placeholder"), "Select...", "question.placeholder default value");
+  assert.equal(question.placeholder, "Select...", "question.placeholder value");
+  question.placeholder = "abc";
+  assert.equal(question.placeholder, "abc", "placeholder property is set to 200px");
+  question.resetPropertyValue("placeholder");
+  assert.equal(question.placeholder, "Select...", "placeholder property value is reset, #1");
+  question.placeholder = "";
+  assert.strictEqual(question.placeholder, "", "placeholder property value is empty string");
+  question.resetPropertyValue("placeholder");
+  assert.equal(question.placeholder, "Select...", "placeholder property value is reset, #2");
 });
 QUnit.test("base.resetPropertyValue() for localization string", function (assert) {
   const survey = new SurveyModel();
diff --git a/tests/surveyserializationtests.ts b/tests/surveyserializationtests.ts
index 7c8cb09514..ea44ead3bb 100644
--- a/tests/surveyserializationtests.ts
+++ b/tests/surveyserializationtests.ts
@@ -737,6 +737,10 @@ QUnit.test("Allow to save empty string for localization strings", function (asse
   assert.equal(q1.placeholder, "test", "set value for placeholder, #3");
   q1.locPlaceholder.clearLocale();
   assert.equal(q1.placeholder, "Select...", "ClearLocale for placeholder");
+  q1.placeholder = "";
+  assert.equal(q1.placeholder, "", "placeholder is empty");
+  q1.locPlaceholder.clearLocale();
+  assert.equal(q1.placeholder, "Select...", "ClearLocale for placeholder, #2");
 });
 QUnit.test("Allow to save empty string for trings with default value", function (assert) {
   const q = new QuestionTextModel("q1");