* gnu/java/awt/peer/gtk/GtkFramePeer.java
        (gtkLayoutSetVisible): New method
        (setMenuBar): Hide layout before setting MenuBar
        and reshow it after.
        * jni/gtk-peer/gnu_java_awt_peer_gtk_GtkWindowPeer.c
        (gtkLayoutSetVisible): Hide or show the Gtk Layout.

From-SVN: r76861