Treeview: wrong size/scale of dragged items

[lalala]

The size is fine. The issue is that image is painted totally blurry.
It’s always the same issue :

DragAndDropContainer::setCurrentDragImage and Retina displays

Is there any way to specify a scale factor for DragAndDropContainer::setCurrentDragImage ? If not, can you add a new parameter? setCurrentDragImage (Image img, int scaleFactor = 1.0) ? Thanks!