vim-tmux-focus-events will send FocusGained and FocusLost events to vim.
This will enable Vim to reload a file that has changed on disk once you switch back to the Vim window.
I don't know airline but if it uses the same events it will work there as well.
This almost works for me:
nmap <buffer> <S-CR> <Plug>SlimeLineSendj
The reason it actually doesn't work is that my terminal Vim actually doesn't recognize the <S-CR> sequence as different from a simple <CR>, so whenever I press <S-CR> Vim just moves to the next line and doesn't really trigger the mapping... If I do the ...