Drag and drop when searching breaks the drag and drop

If you search fro a command and try to do a drag and drop (while searching), then a warning is shown in command line and the drag and drop functionality stops working.

The warning is this:

$ clicompanion
Using locale in system
/usr/lib/python2.7/dist-packages/clicompanionlib/view.py:435: GtkWarning: You must override the default 'drag_data_received' handler on GtkTreeView when using models that don't support the GtkTreeDragDest interface and enabling drag-and-drop. The simplest way to do this is to connect to 'drag_data_received' and call g_signal_stop_emission_by_name() in your signal handler to prevent the default handler from running. Look at the source code for the default handler in gtktreeview.c to get an idea what your handler should do. (gtktreeview.c is in the GTK source code.) If you're using GTK from a language other than C, there may be a more natural way to override default handlers, e.g. via derivation.
  gtk.main()