x_next_com
kb_add(x_next_com, CTRL('N'), 0);
kb_add(x_next_com, CTRL('X'), 'B', 0);
kb_add(x_next_com, CTRL('['), '[', 'B', 0); /* down */
kb_add(x_next_com, CTRL('['), 'O', 'B', 0); /* down */
static int x_next_com(int);
{ x_next_com, "down-history", XF_ARG },