I've posted that answer: http://stackoverflow.com/a/17989511/2605780 and I was fighting a bit with indentation.

No matter what I've set, spaces or tabs, there is no indentation displayed. Both spaces and tabs are ignored. But if you edit a post, you see, that indentation is there.

I see that problem in other places, so it seems to be a problem with Java code in particular, because I haven't notice such problems with Javascript or HTML code blocks.