title: zsh tab completion messes up command line formatting
body: <p>I'm running zsh with oh-my-zsh on OS X. Every time I use zsh's awesome tab-completion, formatting on the current command line prompt gets really screwed up. For example:</p>
  
  <p>I'll be typing <code>cd fo</code> and try to tab-complete for the 'foo' directory; zsh prompts for completion but changes the command line to <code>cd fo cd fo</code> while it's waiting for me to complete. It's not a big deal but very annoying. Any suggestions?</p>