This was originally bug 996796 patch 6, but it's also needed bug 931668, so I'm moving it into its own bug.

Comment on attachment 8441693 [details] [diff] [review] Pass the restyle hint through from ProcessOneRestyle to ComputeStyleChangeFor rather than converting it to a boolean and back Review of attachment 8441693 [details] [diff] [review]: ----------------------------------------------------------------- r=me with comment addressed. ::: layout/base/RestyleManager.cpp @@ +2970,5 @@ > aMinChange, aRestyleTracker, > treeMatchContext, > visibleKidsOfHiddenElement); > > + restyler.Restyle(aRestyleHint); I assume by this point eRestyle_LaterSiblings will never be in aRestyleHint, since RestyleTracker::ProcessOneRestyle is asserting this? Can you add some assertions in ElementRestyler::Restyle{,Self} as they check aRestyleHint in ways that assume that flag isn't in there, and which currently we ensure by checking the bool and only passing in eRestyle_Self/Subtree/0.