I don't think that has got anything to do with the subclassing; you cannot currently instantiate an appindicator object:
$ python -c 'from gi.repository import AppIndicator3; i = AppIndicator3.Indicator(); print i'
(process:29515): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed -c:1: Warning: invalid (NULL) pointer instance -c:1: Warning: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed Speicherzugriffsfehler (Speicherabzug geschrieben)
I don't think that has got anything to do with the subclassing; you cannot currently instantiate an appindicator object:
$ python -c 'from gi.repository import AppIndicator3; i = AppIndicator3. Indicator( ); print i'
(process:29515): Gtk-CRITICAL **: gtk_icon_ theme_get_ for_screen: assertion `GDK_IS_SCREEN (screen)' failed connect_ data: assertion `G_TYPE_ CHECK_INSTANCE (instance)' failed sfehler (Speicherabzug geschrieben)
-c:1: Warning: invalid (NULL) pointer instance
-c:1: Warning: g_signal_
Speicherzugriff