UX Issue: Drag & Drop does not work well with MultiSelection/ExtendedSelection

When selectionMode = MultiSelection or ExtendedSelection
and dragDropMode = DragDrop

then starting a drag&drop operation will change the selection before the drag&drop starts, which is not what the user expects.

The problem is that the selection changes are handled when the mouse button is pressed, while the drag & drop starts later. If there would be an option (i'll gladly also take a workaround for this) for selection changes to be triggered only on mouse release, this would solve the issue.

A good example on how to handle this is windows explorer - it will change the (multi) selection only on mouse release, which makes it easy to drag&drop the desired selection.

The way Qt handles this makes it so that the selection always changes when i'm trying to drag&drop it somewhere - making it very hard and counter intuitive to do what i want.