Slugify filename used as default value in file_selection

issue11917
review436211003
(grafted from 280447e4cdda6196fdef8183139347a03f1319cb)

--HG--
branch : 6.0

tryton/tryton/common/common.py

@@ -423,6 +423,7 @@ def file_selection(title, filename='',
     win.add_buttons(*buttons)
     win.set_icon(TRYTON_ICON)
     if filename:
+        filename = slugify(filename)
         if action in (Gtk.FileChooserAction.SAVE,
                 Gtk.FileChooserAction.CREATE_FOLDER):
             win.set_current_name(filename)