Determines whether a drop is possible before the given dest_path,
at the same depth as dest_path. i.e., can we drop the data in
selection_data at that location. dest_path does not have to
exist; the return value will almost certainly be FALSE if the
parent of dest_path doesn't exist, though.
Determines whether a drop is possible before the given dest_path, at the same depth as dest_path. i.e., can we drop the data in selection_data at that location. dest_path does not have to exist; the return value will almost certainly be FALSE if the parent of dest_path doesn't exist, though.