fetch the inintial value of attributes.event_mask from

fetch the inintial value of attributes.event_mask from

Thu Mar 12 08:55:34 1998  Tim Janik  <timj@gimp.org>

        * gtkitem.c:
        * gtktree.c:
        * gtklist.c: fetch the inintial value of attributes.event_mask from
        gtk_widget_get_events (widget) (pointed out by Damon Chaplin
        <DAChaplin@email.msn.com>).