Add equality comparison between QJsonObject and QJsonValueConstRef

- amends 839cffd521

Fixes: QTBUG-123927
Change-Id: I9174e747478937d4c9ed6522dd603fea50daf203
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

src/corelib/serialization/qjsonobject.cpp

@@ -32,7 +32,7 @@ QT_BEGIN_NAMESPACE
     \brief The QJsonObject class encapsulates a JSON object.
 
     \compares equality
-    \compareswith equality QJsonValue
+    \compareswith equality QJsonValue QJsonValueConstRef
     \endcompareswith
 
     A JSON object is a list of key value pairs, where the keys are unique strings

src/corelib/serialization/qjsonobject.h

@@ -244,8 +244,14 @@ private:
     {
         return comparesEqual(lhs, rhs.toObject());
     }
+    friend bool comparesEqual(const QJsonObject &lhs,
+                              const QJsonValueConstRef &rhs) noexcept
+    {
+        return comparesEqual(lhs, rhs.toObject());
+    }
     Q_DECLARE_EQUALITY_COMPARABLE(QJsonObject)
     Q_DECLARE_EQUALITY_COMPARABLE(QJsonObject, QJsonValue)
+    Q_DECLARE_EQUALITY_COMPARABLE(QJsonObject, QJsonValueConstRef)
     friend class QJsonValue;
     friend class QJsonDocument;
     friend class QJsonPrivate::Value;

tests/auto/corelib/serialization/json/tst_qtjson.cpp

@@ -187,6 +187,8 @@ void tst_QtJson::compareCompiles()
     QTestPrivate::testEqualityOperatorsCompile<QJsonValueRef>();
     QTestPrivate::testEqualityOperatorsCompile<QJsonArray, QJsonValue>();
     QTestPrivate::testEqualityOperatorsCompile<QJsonObject, QJsonValue>();
+    QTestPrivate::testEqualityOperatorsCompile<QJsonObject, QJsonValueConstRef>();
+    QTestPrivate::testEqualityOperatorsCompile<QJsonObject, QJsonValueRef>();
     QTestPrivate::testEqualityOperatorsCompile<QJsonValueConstRef, QJsonValue>();
     QTestPrivate::testEqualityOperatorsCompile<QJsonValueRef, QJsonValue>();
     QTestPrivate::testEqualityOperatorsCompile<QJsonValueRef, QJsonValueConstRef>();
@@ -670,6 +672,7 @@ void tst_QtJson::testObjectInsertCopies()
         QCOMPARE(obj.size(), 2);
         QCOMPARE(obj.value("value"), "TEST");
         QCOMPARE(obj.value("prop2"), "TEST");
+        QT_TEST_EQUALITY_OPS(rv, obj["value"].toObject(), true);
     }
     {
         QJsonObject obj;