Deprecate QQuickDragHandler::translation()

Amends 60d11e1f69, in which we deprecated
the QML property.  In C++ this is still a private class, so most non-QML
user code won't be using it; but we should eventually ensure that it is
no longer in use in our code too (it's nice to have this short name, but
handlers are inconsistent about which of the short-name properties are
persistent and which are gesture-scoped).

Task-number: QTBUG-94168
Change-Id: Ic2bac67c4c5758e7edce8834eae7eb74dc3e2471
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

src/quick/handlers/qquickdraghandler_p.h

@@ -61,7 +61,9 @@ class Q_QUICK_PRIVATE_EXPORT QQuickDragHandler : public QQuickMultiPointHandler
     Q_OBJECT
     Q_PROPERTY(QQuickDragAxis * xAxis READ xAxis CONSTANT)
     Q_PROPERTY(QQuickDragAxis * yAxis READ yAxis CONSTANT)
+#if QT_DEPRECATED_SINCE(6, 2)
     Q_PROPERTY(QVector2D translation READ translation NOTIFY translationChanged)
+#endif
     Q_PROPERTY(QVector2D activeTranslation READ activeTranslation NOTIFY translationChanged REVISION(6, 2))
     Q_PROPERTY(QVector2D persistentTranslation READ persistentTranslation WRITE setPersistentTranslation NOTIFY translationChanged REVISION(6, 2))
     Q_PROPERTY(SnapMode snapMode READ snapMode WRITE setSnapMode NOTIFY snapModeChanged REVISION(2, 14))
@@ -84,7 +86,9 @@ public:
     QQuickDragAxis *xAxis() { return &m_xAxis; }
     QQuickDragAxis *yAxis() { return &m_yAxis; }
 
+#if QT_DEPRECATED_SINCE(6, 2)
     QVector2D translation() const { return m_activeTranslation; }
+#endif
     QVector2D activeTranslation() const { return m_activeTranslation; }
     void setActiveTranslation(const QVector2D &trans);
     QVector2D persistentTranslation() const { return m_persistentTranslation; }