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.
| this | |
| dest_path |
destination row |
| selection_data |
the data being dragged |
|
true if a drop is possible before |