We now don't safe an AnchoredFile anymore, but a Path and
construct the AnchoredFile just before the operation is carried out.
This means the copy and move buffers cannot contain stale references
to files that don't exist anymore.
If the right click happens on an item that is already selected,
don't pass on the signal so the selection which may span across
multiple files is kept.
Otherwise, pass on the signal which means the item under the cursor
will be selected.
This currently misbehaves (as in: doesn't work) with IconView
properly.
