Do we need: A folder cannot be dropped into itself

[Alex Fiestas]

Just that, do we really need to notify the user that a folder can't be drop 
into itself?

The only reason I could find is when you drag more than one folder/file and 
the action is not performed beacuse of that error. Maybe in that case we could 
move everything into the folder besides the error?

BTW I realized this because of the new way of showing errors which I love :p