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

source -- a gtk-tree-drag-source object
path -- a gtk-tree-path instance with 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.