marijnh/CodeMirror — pull request #2732 by optimix (2014-07-28 15:16:28+00:00)
Title:  [merge] allowEditingOriginals option to edit all compared files 

![merge](https://cloud.githubusercontent.com/assets/476495/3722489/1c842d12-166a-11e4-9b40-c63bb1282fa4.png)
There is only a small bug remaining: when the size is too small, both arrows overlap.