Line wraps unexpectedly with tab-delimited data

I do a lot of work with tab-delimited data. I don’t want the lines to wrap, but no matter how wide I make my document, or what setting I choose in format/line wrap, I get results like this. What’s causing this? Thanks!

I’m sorry, I see the problem, but don’t expect to get a fix out anytime soon. I do plan to get back to working on WriteRoom eventually, but for the time being TaskPaper is taking all of my time.