This commit reverts the tmux module back to the original behavior but
doesn't set `destroy-unattached` to on `on` globally and provides an
option for attaching to the background or last-used session.
When Emacs and Vim are launched from outside of an interactive shell,
$TMUX and $STY are not set; check for Emacs and Vim environment
variables instead.
Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Setting the auto-start 'remote' and 'local' zstyles for the screen and
tmux modules to 'true' automatically starts a session in SSH connections
and in local terminals respectively.
Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
