QJsonValue: use the fully-encoded form of a URL in fromVariant()

For compatibility with other parsers that may expect it to be so.

Change-Id: I56b444f9d6274221a3b7fffd150cd66390f98fd5
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

src/corelib/serialization/qjsonvalue.cpp

@@ -40,6 +40,7 @@
 #include <qjsonobject.h>
 #include <qjsonvalue.h>
 #include <qjsonarray.h>
+#include <qurl.h>
 #include <qvariant.h>
 #include <qstringlist.h>
 #include <qdebug.h>
@@ -407,6 +408,14 @@ QJsonValue &QJsonValue::operator =(const QJsonValue &other)
                 \li QMetaType::QVariantHash
             \endlist
         \li QJsonValue::Object
+
+    \row
+        \li
+            \list
+                \li QMetaType::QUrl
+            \endlist
+        \li QJsonValue::String. The conversion will use QUrl::toString() with flag
+            QUrl::FullyEncoded, so as to ensure maximum compatibility in parsing the URL
     \endtable
 
     For all other QVariant types a conversion to a QString will be attempted. If the returned string
@@ -439,6 +448,8 @@ QJsonValue QJsonValue::fromVariant(const QVariant &variant)
     case QVariant::Hash:
         return QJsonValue(QJsonObject::fromVariantHash(variant.toHash()));
 #ifndef QT_BOOTSTRAPPED
+    case QVariant::Url:
+        return QJsonValue(variant.toUrl().toString(QUrl::FullyEncoded));
     case QMetaType::QJsonValue:
         return variant.toJsonValue();
     case QMetaType::QJsonObject:

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

@@ -82,6 +82,8 @@ private Q_SLOTS:
 
     void fromVariant_data();
     void fromVariant();
+    void fromVariantSpecial_data();
+    void fromVariantSpecial();
     void toVariant_data();
     void toVariant();
     void fromVariantMap();
@@ -1174,6 +1176,24 @@ void tst_QtJson::fromVariant()
     QCOMPARE(variant.toJsonValue(), jsonvalue);
 }
 
+void tst_QtJson::fromVariantSpecial_data()
+{
+    QTest::addColumn<QVariant>("variant");
+    QTest::addColumn<QJsonValue>("jsonvalue");
+
+    // Qt types with special encoding
+    QTest::newRow("url") << QVariant(QUrl("https://example.com/\xc2\xa9 "))
+                         << QJsonValue("https://example.com/%C2%A9%20");
+}
+
+void tst_QtJson::fromVariantSpecial()
+{
+    QFETCH( QVariant, variant );
+    QFETCH( QJsonValue, jsonvalue );
+
+    QCOMPARE(QJsonValue::fromVariant(variant), jsonvalue);
+}
+
 void tst_QtJson::toVariant_data()
 {
     fromVariant_data();