This cropped up when I changed the following code:
Gtk.Application.__init__(self, application_id='foo', flags=Gio.ApplicationFlags.HANDLES_COMMAND_LINE)
To this:
Gtk.Application.__init__(self, application_id='foo', flags=Gio.ApplicationFlags.HANDLES_OPEN)
Not sure if that helps you track it down.
This cropped up when I changed the following code:
Gtk.Applicatio n.__init_ _(self, application_ id='foo' , flags=Gio. ApplicationFlag s.HANDLES_ COMMAND_ LINE)
To this:
Gtk.Applicatio n.__init_ _(self, application_ id='foo' , flags=Gio. ApplicationFlag s.HANDLES_ OPEN)
Not sure if that helps you track it down.