I have an iPhone 6+s on which I like to punish myself with by reviewing diffs. In general it works out pretty well. However tapping the 'show 20 lines) or 'Show all N lines' links results in a unusable state.
The expanded lines are rendered with a single character per line.
before: http://imgur.com/5ChqV6A
expanded: http://imgur.com/bifmSBm
I apologize for the imgur links, but there doesn't seem to be a way to upload files from a mobile device.