title: ctrl-z to suspend vim inside of tmux not working
body: <p>So, I'm getting into using tmux, coming from GNU screen. Vim is my editor of choice. Often I find it useful to use <kbd>Ctrl</kbd>+<kbd>Z</kbd> to suspect Vim to get to my shell. I do this in screen easily. There I have my prefix key rebound to <kbd>Ctrl</kbd>+<kbd>Z</kbd>, so hitting <kbd>Ctrl</kbd>+<kbd>Z</kbd>+<kbd>Z</kbd> sends a SIGSTOP to Vim, and I'm in the shell. A simple "fg" jumps me back, all without leaving screen.</p>
  
  <p>Now, in tmux this does not work for me. I've tried the default <kbd>Ctrl</kbd>+<kbd>B</kbd> prefix, rebinding to <kbd>Ctrl</kbd>+<kbd>Z</kbd> and unbinding the z "toggle pane zoom" option in tmux in case that conflicted. The only thing that works is hitting Prefix-Ctrl-Z sends SIGSTOP to tmux, suspending it, but I don't want that. I want the SIGSTOP to go to Vim.</p>
  
  <p>I am on Debian Jessie using i3 as my window manager, and I can't find any conflicting keybindings, so I am open to suggestions on how to get this working. </p>
  
  <p>Thanks.</p>