Cut off letters after scrolling to the right

I noticed a very minor imperfection but this is likely to be caused by CodeMirror. When you write a long text and move the scrollbar to the right, some letters are being cut off:


I wanted to check first because I tested some CodeMirror demos and didn't see the same issue in any of them. This is happening in Chrome (40.0.2214.111) and Firefox (35.0.1) using Ipython 2.3.1 and 3 (dev).