Dragging a WebView on the scene does not work correctly

1. Open a QML file in Quick Designer.
2. Select "Web View" from the Library view, drag it over the canvas but do not drop it.
   While you do this, "Web View" is being de-selected. The mouse pointer does not show any item being dragged.
3. Check the Navigator view.
   The WebView has already been added. Moving the mouse pointer does not change this.
4. Press ESC twice.
   The WebView has been added to the QML file.

All this is wrong:

• When dragging something, users should always be able to see what they are dragging (2.).
• Moving the mouse pointer should influence the target position of the dragged item (3.).
• Pressing ESC should cancel the drag & drop action. The QML should not be changed then (4.).