===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/tty.c,v
retrieving revision 1.273
retrieving revision 1.274
diff -c -r1.273 -r1.274
*** src/usr.bin/tmux/tty.c	2017/05/11 11:38:49	1.273
--- src/usr.bin/tmux/tty.c	2017/05/12 10:49:04	1.274
***************
*** 1,4 ****
! /* $OpenBSD: tty.c,v 1.273 2017/05/11 11:38:49 nicm Exp $ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: tty.c,v 1.274 2017/05/12 10:49:04 nicm Exp $ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 798,803 ****
--- 798,804 ----
      u_int ny, u_int px, u_int nx, u_int bg)
  {
  	u_int	yy;
+ 	char	tmp[64];
  
  	log_debug("%s: %u,%u at %u,%u", __func__, nx, ny, px, py);
  
***************
*** 813,818 ****
--- 814,830 ----
  		    tty_term_has(tty->term, TTYC_ED)) {
  			tty_cursor(tty, 0, py);
  			tty_putcode(tty, TTYC_ED);
+ 			return;
+ 		}
+ 
+ 		/*
+ 		 * If we're setting a background colour (so it is not default),
+ 		 * we can use DECFRA.
+ 		 */
+ 		if (tty->term_type == TTY_VT420 && bg != 8) {
+ 			xsnprintf(tmp, sizeof tmp, "\033[32;%u;%u;%u;%u$x",
+ 			    py + 1, px + 1, py + ny, px + nx);
+ 			tty_puts(tty, tmp);
  			return;
  		}
  	}