gtk:tree-drag-source-drag-data-delete (source path)

source -- a gtk:tree-drag-source object
path -- a gtk:tree-path instance for the row that was being dragged

True if the row was successfully deleted.

Asks the gtk:tree-drag-source object to delete the row at path, because it was moved somewhere else via drag and drop. 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.