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static void action_fullscreen(GtkToggleAction *_action, GtkWindow *_window){  if(gtk_toggle_action_get_active(_action))gtk_window_fullscreen(_window);  else gtk_window_unfullscreen(_window);}static const gchar *fullscreen_ui_desc= "<ui>\  <menubar name='MainMenu'>\  <separator/>\  <menuitem action='Fullscreen'/>\  </menubar>\  </ui>";static GtkToggleActionEntry fullscreen_toggle_actions[]={  {"Fullscreen",NULL,N_("Fullscreen"),"F6",NULL,   G_CALLBACK(action_fullscreen),FALSE},};void gjiten_add_fullscreen_action(GtkUIManager *_manager,GtkWindow *_window){  GtkActionGroup *actions;  actions=gtk_action_group_new("fullscreen");  gtk_action_group_set_translation_domain(actions,GETTEXT_PACKAGE);  gtk_action_group_add_toggle_actions(actions,fullscreen_toggle_actions,   G_N_ELEMENTS(fullscreen_toggle_actions),_window);  gtk_ui_manager_add_ui_from_string(_manager,fullscreen_ui_desc,-1,NULL);  gtk_ui_manager_insert_action_group(_manager,actions,0);  if(!gdk_net_wm_supports(gdk_atom_intern("_NET_WM_STATE_FULLSCREEN",FALSE))){    GtkAction *action;    action=gtk_action_group_get_action(actions,"Fullscreen");    gtk_action_set_sensitive(action,FALSE);  }}