title: How do you restrict iswitch buffer names to 1 line in the minibuffer (behavior changed after emacs 24.1 upgrade on osx)?
body: <p>When I upgraded to (vanilla) emacs 24.1 on OSX, using iswitch for switching buffers seems to behave differently.</p>
  
  <p>When I press ctrl-x b to switch buffers, instead of restricting the list of buffers to 1 line, it shows every single buffer by expanding the mini-buffer to be several lines long, then progressively removes buffers as I type in the buffer name I'm switching to. </p>
  
  <p>I find having the status bar and mini buffer bumping up and down whenever I switch buffers to be visually distracting, so I want to recover the previous behavior, which cuts off buffer names which after 1 line. How do I do this?</p>