Asks the `GtkTreeDragSource` to delete the row at path, because it was moved somewhere else via drag-and-drop.
Use list models instead
Returns false if the deletion fails because path no longer exists, or for some
model-specific reason. Should robustly handle a path no longer found in the model!
| this |
a `GtkTreeDragSource` |
| path |
row that was being dragged |
|
true if the row was successfully deleted |