add checks for empty menu items to behave like insensitive items (#59456)

add checks for empty menu items to behave like insensitive items (#59456)

Thu Nov 29 21:35:56 2001  Kristian Rietveld  <kristian@planet.nl>

        * gtk/gtkmenu.c (gtk_menu_motion_notify): add checks for
        empty menu items to behave like insensitive items (#59456)

        * gtk/gtkmenuitem.c (gtk_real_menu_item_activate_item): select
        next item if the first item in the menu is a tear off item
        (#59456-2, suggestion by Matthias Clasen)

        * gtk/gtkmenushell.c (gtk_menu_shell_button_press),
        (gtk_menu_shell_button_release), (gtk_menu_shell_entry_notify),
        (gtk_menu_shell_leave_notify), (gtk_real_menu_shell_move_current),
        (gtk_real_menu_shell_activate_current): add check, so empty
        menu items behave like insensitive items (#59456)

        * gtk/gtkmenuitem.[ch]: add _gtk_menu_item_is_selectable to make
        the checks more readable ...

        * gtk/gtkmenushell.c (gtk_menu_shell_button_press),
        (gtk_menu_shell_button_release): causes the menu to dropdown if the
        caption is clicked again (#64977)