title: tmux status bar highlights the session name in red if a window fails
body: <p>I'm using tmux 2.0, installed on OSX with Homebrew. My terminal uses the solarized colour scheme.</p>
  
  <p>If I move my tmux.conf (to ensure I'm using default settings) then my status line looks like this:</p>
  
  <p><a href="https://i.stack.imgur.com/wqbT8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wqbT8.png" alt="default status line"></a></p>
  
  <p>If I then run a process which fails, the session name gets highlighted in red: </p>
  
  <p><a href="https://i.stack.imgur.com/N8pNe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/N8pNe.png" alt="errored status line"></a></p>
  
  <p>No matter what I do, this stays highlighted in red. I've tried all the settings I can find to try and change this behaviour but I haven't found any that change it at all.</p>
  
  <p>The failing process is the ruby command line tool <code>guard</code>. I'm making it fail because it depends on zeus and I don't have zeus running. In this scenario, guard shows an error in the terminal but doesn't exit. This is the scenario that this red highlighting happens in.</p>
  
  <p>If I make it fail fatally and exit (e.g. if there is no Guardfile) then the highlighting doesn't happen.</p>
  
  <p>I assume that tmux is recognising that some kind of error has happened (because the process is returning an error response code?) and is using the highlighting to alert me to that.</p>
  
  <p>Some of the settings I've tried to modify include:</p>
  
  <ul>
  <li><code>window-status-activity-attr</code></li>
  <li><code>window-status-activity-bg</code></li>
  <li><code>display-panes-active-colour</code></li>
  <li><code>bell-action</code></li>
  <li><code>bell-on-alert</code></li>
  </ul>