Comment 6 for bug 289268

> I think it would be useful to have a separate means to configure the
> diff program. Other commands like merge and commit also show diffs,
> as do some guis, and it would be good to have a single place to set
> it. So please do post it for review if you haven't already.

My patch *certainly* doesn't change the behavior of those other commands, and it'd take a lot more work, or knowledge, to do that. I won't be doing that, sorry.