Interpret TERM=tmux as TERM=screen.
Interpret TERM=tmux as TERM=screen.

Old versions of tmux required TERM=screen. New versions say TERM=tmux
is ok too. Patch seems to work as expected with mle.

nsf/termbox,nsf/termbox,nsf/termbox,termbox/termbox,termbox/termbox,termbox/termbox