Hi,

I know the GnomeMDI framework is deprecated in Gnome 2.0 but I really
like the simplicity of the interface so I decided to work on it.  But
when destroying the GnomeMDI (GtkObject) the program always crashes. 
Also, when removing children, there is a warning about removing a
floating reference.  I tracked down the problem and found a solution.

Since GnomeMDI is a GtkObject descendant it has a floating reference
when it is created and it does not get removed since it has never been
added in a container widget.  If you call g_object_unref on it there
will be complications.  In order to remove the floating reference (and
finalize the object) the following changes may help:

gnome-mdi.c

AROUND LINE 252

REMOVE:

//      if (G_OBJECT (object)->ref_count > 0)
//              g_object_unref(object);

ADD:

        gtk_object_sink (GTK_OBJECT(object));



AROUND LINE 1466

REMOVE:

//      g_object_unref(G_OBJECT(child));

ADD:
        gtk_object_sink(GTK_OBJECT(child));


After those changes the crashes disappear and all finalizations are done.