is it possible provide drag and drop feedback based on the source of the drag? how can I know in the drop target the source of the DND operation?
for example if I have a list of files from where I can drag files and where I can drop files... how do I know if the source and the destination of the drag is the same during the drag operation... so I could present a wx.DragNone feedback (you cannot copy a file into itself or move a file to the same location).
Any idea is welcomed. 
thank you in advance.
Peter.