The drag operation failed due to some unspecified error.
The pointer or keyboard grab used for the drag operation was broken.
No suitable drag target.
The drag operation was successful.
The drag operation timed out.
The user cancelled the drag operation.
Gives an indication why a drag operation failed. The value can by obtained by connecting to the Gtk.Widget.SignalSignatures.drag_failed | Gtk.Widget::drag-failed signal.