[PyQt] QTreeView DragDropMode (Copy vs. Move)

[Bart Kroon]

When time is short I would say, add a method to the source model that you can 
call from the target model that removes the received items. That would make it 
work at least. It might even be the best way to do such a thing, but I'm not 
sure.

It seems you handle the dragged in mimedata as the object coming from the 
source model. That doesn't seem right to me, you should serialise the 
information in the source models mimeData() method. This can be done in any 
way you like, so you could include sufficient information to describe the 
original node and remove it from the source model.

-- Bart