Remove more usages of asQWidget()

Adds View::mapTo()

src/qtwidgets/views/ViewWrapper_qtwidgets.h

@@ -56,7 +56,7 @@ public:
     QVariant property(const char *) const override;
     bool isNull() const override;
     void setWindowTitle(const QString &title) override;
-
+    QPoint mapTo(View *, QPoint) const override;
     DropArea *asDropArea() const override;
 
     QWidget *widget() const;