title: What causes this graphical error in emacs with linum-mode on OS X?
body: <p>I get this graphical error with linum-mode in my Emacs. I tried upgrading from 23 to 24 (via git) and I've tried both with various supplied binaries online and with my home-compiled version. What I'm really interested in is where to start diagnosing the problem.</p>
  
  <p><img src="https://i.stack.imgur.com/9j04G.png" alt="&quot;Tearing&quot; of numbers in linum-mode"></p>
  
  <p>The problem goes away if I scroll the torn line numbers off screen and back in.</p>