Remove support for "prepainting" the menu before realizing other than via

Remove support for "prepainting" the menu before realizing other than via

Wed Dec 12 16:18:26 2001  Owen Taylor  <otaylor@redhat.com>
        * gtk/gtkmenu.c (gtk_menu_realize): Remove support for
        "prepainting" the menu before realizing other than
        via gtk_style_set_background() - this was broken when
        we added menu scroll support.
        * gtk/gtkmenu.c (gtk_menu_paint): Pay attention to the
        window in the expose event -- fixes problem with border
        flashing during scrolling.