tests: Fix overloaded signal "parentChanged()"

src/DockWidgetBase.cpp

@@ -784,7 +784,12 @@ void DockWidgetBase::Private::show()
 
 void DockWidgetBase::onParentChanged()
 {
+#ifdef KDDOCKWIDGETS_QTWIDGETS
+    // TODO: In v1.4, remove this part and use the signal emitting the arg
     Q_EMIT parentChanged();
+#else
+    Q_EMIT parentChanged(this);
+#endif
     d->updateToggleAction();
     d->updateFloatAction();
 }

src/DockWidgetBase.h

@@ -374,8 +374,10 @@ public:
     static DockWidgetBase* byName(const QString &uniqueName);
 
 Q_SIGNALS:
+#ifdef KDDOCKWIDGETS_QTWIDGETS
     ///@brief signal emitted when the parent changed
     void parentChanged();
+#endif
 
     ///@brief signal emitted when the DockWidget is shown. As in QEvent::Show.
     void shown();

src/private/quick/QWidgetAdapter_quick.cpp

@@ -135,7 +135,7 @@ void QWidgetAdapter::itemChange(QQuickItem::ItemChange change, const QQuickItem:
     case QQuickItem::ItemParentHasChanged: {
         QEvent ev(QEvent::ParentChange);
         qApp->sendEvent(this, &ev); // Not calling event() directly, otherwise it would skip event filters
-        Q_EMIT parentChanged();
+        Q_EMIT parentChanged(this);
         break;
     }
     case QQuickItem::ItemVisibleHasChanged: {

src/private/quick/QWidgetAdapter_quick_p.h

@@ -176,7 +176,6 @@ public:
     static QQuickItem *createItem(QQmlEngine *, const QString &filename);
     static void makeItemFillParent(QQuickItem *item);
 Q_SIGNALS:
-    void parentChanged();
     void geometryUpdated(); // similar to QLayout stuff, when size constraints change
 protected:
     void create();