I checked in the view manager hierarchy unification, and after some worrying about Tp regressions, it looked OK. But it caused problems, due to the way it interacts with view update batching. See https://bugzilla.mozilla.org/show_bug.cgi?id=360789. View update batching is really fragile and I'm reluctant to hack on it to try to get things working for 1.9a1, so I backed out VMHU.
We might be able to reland VMHU if we can just hunt down and eliminate unnecessary synchronous repaints. I was able to fix at least one testcase on Linux by doing this, but the patch didn't help Windows. That is something I will try to look into if I can scare up some Windows help. In the bigger picture, view update batching basically does two things: a) batches changes to child widget geometry b) batches view invalidations It doesn't work well when we get a synchronous paint (e.g. from scrolling) during a batch. I think we should try to get rid of all synchronous paints, they cause reentrancy and are generally painful. Rob _______________________________________________ dev-tech-layout mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-layout
