title: Fix Vim + Tmux yank/paste on unnamed register
body: <p>While using vim inside a tmux session I cannot yank or paste to the unnamed register. Going to a named register works fine, but unnamed never works.</p>
  
  <p>Error is:</p>
  
  <pre><code>E353: Nothing in register *
  </code></pre>
  
  <p>Without tmux, vim works fine using my current settings. How do I fix it so I can use <kbd>y</kbd> then <kbd>p</kbd> without errors and without specifying the register?</p>