Handle the case where the pointer isn't on the same screen as the widget

Handle the case where the pointer isn't on the same screen as the widget

Sat Dec 14 01:00:12 2002  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkmenu.c (gtk_menu_position): Handle the case
        where the pointer isn't on the same screen as the widget
        by centering the menu on the widget's screen. (#94563)