QML engine: fix conversion scores for sequences in CallOverloaded

A QV4Sequence can be converted back to its underlying container; we
therefore should give the conversion of QV4Sequence to container a high
score if metaTypeForSequence and the target metatype agree.
This has a larger effect in Qt 6 than in Qt 5, as we now can have new
sequence types for any (QMeta)Container.

Fixes: QTBUG-87616
Change-Id: I2bf02ebadbf9b707719d09edaf14b112eb2caf4f
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

3 files changed, 45 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlecmascript/data/sequenceConvert.qml b/tests/auto/qml/qqmlecmascript/data/sequenceConvert.qml
new file mode 100644
index 0000000000..405d784dfe
--- /dev/null
+++ b/tests/auto/qml/qqmlecmascript/data/sequenceConvert.qml
@@ -0,0 +1,10 @@
+import QtQml 2.0
+import qt.test 1.0
+
+QtObject {
+    Component.onCompleted: {
+        var myList = SequenceConvertObject.getValues()
+        SequenceConvertObject.call(myList)
+    }
+}
+
diff --git a/tests/auto/qml/qqmlecmascript/testtypes.h b/tests/auto/qml/qqmlecmascript/testtypes.h
index dead289b15..878dd79466 100644
--- a/tests/auto/qml/qqmlecmascript/testtypes.h
+++ b/tests/auto/qml/qqmlecmascript/testtypes.h
@@ -1748,6 +1748,27 @@ public slots:
     void selection(const QItemSelection &, int = 0) { funcCalled = QLatin1String("QItemSelection"); }
 };
 
+class SequenceConvertObject : public QObject
+{
+    Q_OBJECT
+
+public:
+    QString funcCalled;
+public slots:
+
+    Q_INVOKABLE QStringList getValues() const {
+        return QStringList() << QStringLiteral("one") << QStringLiteral("two");
+    }
+
+    Q_INVOKABLE void call(const QStringList &) {
+        funcCalled = QLatin1String("stringlist");
+    }
+
+    Q_INVOKABLE void call(const QList<int> &) {
+        funcCalled = QLatin1String("intlist");
+    }
+};
+
 struct ClassWithQProperty2 : public QObject
 {
     Q_OBJECT
diff --git a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
index 8778a1e1ac..96fdd012e2 100644
--- a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
+++ b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
@@ -391,6 +391,7 @@ private slots:
     void urlSearchParamsConstruction();
     void urlSearchParamsMethods();
     void variantConversionMethod();
+    void sequenceConversionMethod();
 
     void gcCrashRegressionTest();
 
@@ -9497,6 +9498,19 @@ void tst_qqmlecmascript::variantConversionMethod()
     QCOMPARE(obj.funcCalled, QLatin1String("QModelIndex"));
 }
 
+void tst_qqmlecmascript::sequenceConversionMethod()
+{
+    QQmlEngine qmlengine;
+
+    SequenceConvertObject obj;
+    qmlRegisterSingletonInstance("qt.test", 1, 0, "SequenceConvertObject", &obj);
+
+    QQmlComponent component(&qmlengine, testFileUrl("sequenceConvert.qml"));
+    QScopedPointer<QObject> o(component.create());
+    QVERIFY(o != nullptr);
+    QCOMPARE(obj.funcCalled, QLatin1String("stringlist"));
+}
+
 QTEST_MAIN(tst_qqmlecmascript)
 
 #include "tst_qqmlecmascript.moc"