GTK3 DND-Function don't except files

Hi,

up to now I worked with the following dnd function. It worked very well, 
I could drop files and http-adresses from browser.

Now I changed to Linux mint 19.2, dnd with files will not work anymore.

Unfortunately the dnd function aren't well described.

UH


def create_drop_space cb
     cb.drag_dest_set( Gtk::DestDefaults::ALL, [['text/plain', 0, 0]], 
Gdk::DragAction::COPY)
     cb.signal_connect('drag_data_received') do |w, context, x, y, data, 
info, time|
         #Encoding.default_internal
         type=data.text[0..4]                # what is dropped ?
         path=data.text[0..data.text.length] # length of dropped
         aS=data.data
         kwords=cb.active_iter[0].split(',')
         save_dnd_data data, kwords
     end

end


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