(widget_id_tick): Renamed from popup_id_tick.
(popup_get_selection, popup_activated, popup_activate_callback, menubar_selection_callback, popup_deactivate_callback, single_submenu): New or replaced functions. (popup_activated_flag): New variable. (dispatch_dummy_expose, event_is_in_menu_item, map_event_to_object): Removed. (update_frame_menubar): Use lw_refigure_widget to provide widget set independence. (set_frame_menubar): Use lw_allow_resizing to control unsightly Motif menubar resizing in a widget set independent fashion. (xmenu_show): Removed menubar handling code, since that is now done in lwlib. Display a popup menu title centered and followed by two separators. Use lw_popup_menu() to display the menu. Use popup_get_selection() to deal with X11 event handling while the menu is posted.
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