Hello James. You're right: I messed up by using a tab indent that looked good on my Windows-based desktop and git used its magic to convert it back to the unix format. 

I have fixed this issued by issuing a new pull request for https://github.com/plepropre/playframework/commit/069975c960f8a98562cae1e462a2df707be96801

Sorry for this problem; I'm not used (yet) to working with GitHub.