Now we finally pass acid2, we've improved performance, and fixed a lot of bugs. Yay!
Also, we can now make major reflow changes again without fear of making David's life miserable with difficult merges to the reflow branch.
Update Just to clarify --- the reflow branch landed after we branched for 1.9 alpha 1 (this was intentional!), so 1.9 alpha 1 does not have the reflow branch and does not pass acid2. You'll have to get a nightly build or wait for 1.9 alpha 2 to come out.