GTK warnings in minimal sample after recent changes

[Vadim Zeitlin]

 Hi (Paul?),

 Do you have any idea about the warnings which appear when exiting the
minimal sample with the latest svn:

% ./samples/minimal/minimal

(minimal:12766): GLib-GObject-WARNING **: instance of invalid non-instantiatable type `(null)'

(minimal:12766): GLib-GObject-CRITICAL **: g_signal_handlers_disconnect_matched: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(minimal:12766): Gtk-CRITICAL **: gtk_accel_group_disconnect: assertion `GTK_IS_ACCEL_GROUP (accel_group)' failed

(minimal:12766): GLib-GObject-WARNING **: instance of invalid non-instantiatable type `(null)'

(minimal:12766): GLib-GObject-CRITICAL **: g_signal_handlers_disconnect_matched: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(minimal:12766): Gtk-CRITICAL **: gtk_accel_group_disconnect: assertion `GTK_IS_ACCEL_GROUP (accel_group)' failed

? I don't know when exactly did this appear as I last updated my local tree
some time ago but it can't date from more than a week or so.

 I believe the warnings are given whenever you close a frame with a menu
bar but I didn't really look into this yet to be honest.

 TIA,
VZ