From cd40e32855b739437af135c9a84912e081be2acc Mon Sep 17 00:00:00 2001
From: Andrew Telnov <andrew.telnov@gmail.com>
Date: Mon, 5 Feb 2024 14:17:02 +0200
Subject: [PATCH] Allow to set empty string to displayName property attribute

---
 src/jsonobject.ts        |  2 +-
 tests/jsonobjecttests.ts | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/jsonobject.ts b/src/jsonobject.ts
index 33afe3b406..c91a8bfa10 100644
--- a/src/jsonobject.ts
+++ b/src/jsonobject.ts
@@ -819,7 +819,7 @@ export class JsonMetadataClass {
       if (!Helpers.isValueEmpty(propInfo.maxLength)) {
         prop.maxLength = propInfo.maxLength;
       }
-      if (!Helpers.isValueEmpty(propInfo.displayName)) {
+      if (propInfo.displayName !== undefined) {
         prop.displayName = propInfo.displayName;
       }
       if (!Helpers.isValueEmpty(propInfo.category)) {
diff --git a/tests/jsonobjecttests.ts b/tests/jsonobjecttests.ts
index d1215f4bf9..a164ea56e1 100644
--- a/tests/jsonobjecttests.ts
+++ b/tests/jsonobjecttests.ts
@@ -3264,3 +3264,16 @@ QUnit.test("Test showInMultipleColumns prop visibility", function (assert) {
   assert.ok(prop, "property is here");
   assert.equal(prop.isVisible("", column), true, "column is visible");
 });
+QUnit.test("Versions & alternative name", function (assert) {
+  const prop1 = Serializer.addProperty("question", { name: "testProperty1", displayName: "" });
+  const prop2 = Serializer.addProperty("question", { name: "testProperty2", displayName: undefined });
+  const prop3 = Serializer.addProperty("question", { name: "testProperty3" });
+
+  assert.strictEqual(prop1.displayName, "", "prop1");
+  assert.strictEqual(prop2.displayName, undefined, "prop2");
+  assert.strictEqual(prop3.displayName, undefined, "prop3");
+
+  Serializer.removeProperty("question", "testProperty1");
+  Serializer.removeProperty("question", "testProperty2");
+  Serializer.removeProperty("question", "testProperty3");
+});