I'm pretty sure it does. I don't think it bumps it, but it does change the thread to say that there are posts you haven't read yet. I think that's a pretty good idea.
I don't think bumping if it's from an edit is that bad, after all it's being bumped because you've most likely changed something. Though, if it gets bumped from edits, it'll be a lot harder to tell if it's a legitimate bump, I'll give you that. Though, I don't think bumping is that big of a deal anymore, the forums aren't nearly as active as they used to be(or it seems), where after a day your thread has been pushed onto the second page. Most threads stick around on the first page for a while, no matter how little attention they get.