Add back the monitoring of the selection when the combo isn't popped down;

Add back the monitoring of the selection when the combo isn't popped down;

Wed Dec  4 12:44:50 2002  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkcombo.c (gtk_combo_selection_changed): Add
        back the monitoring of the selection when the combo
        isn't popped down; apparently people depended upon
        the side-effect where gtk_combo_set_popdown_strings()
        would wipe out the contents of the list when browse-mode
        autoselected the first item in the list. (#100347)