A few patches coming up.

The first hunk of patch #1 causes regressions. The problem is that for, say, an inactive transform display item or an SVG-transformed display item, GetAnimatedGeometryRootFor(i, aBuilder) returns the item's own frame as the geometry root --- because we don't let the search go up beyond i's ReferenceFrame(), which is its own frame. OTOH GetAnimatedGeometryRootFor(i->Frame()) would search all the way up to an actual animated geometry root. So we think the item is an animated geometry root and RequiredLayerStateForChildrenInternal returns LAYER_ACTIVE, which is wrong.

https://hg.mozilla.org/integration/mozilla-inbound/rev/b5486b9ed88c https://hg.mozilla.org/integration/mozilla-inbound/rev/7829e535cdd7

So this made bug 791480 start happening 100% of the time on the Win8 reftest-noaccel. I landed https://hg.mozilla.org/integration/mozilla-inbound/rev/94e20568f4e8 before realizing that this was a new 100%-of-the-time failure rather than an intermittent whose annotation needed updating.

Backed out: https://hg.mozilla.org/integration/mozilla-inbound/rev/148794d81e95

https://hg.mozilla.org/mozilla-central/rev/b5486b9ed88c https://hg.mozilla.org/mozilla-central/rev/7829e535cdd7

Per comment 7, this shouldn't have been merged to m-c.

(In reply to Ryan VanderMeulen [:RyanVM UTC-5] from comment #9) > Per comment 7, this shouldn't have been merged to m-c. grr sorry yeah my fault will merge the backout cset to m-c when its ready

Also, shouldn't dbaron's change in comment 6 be backed out? Doesn't look like it was.

(In reply to Kartikaya Gupta (email:kats@mozilla.com) from comment #11) > Also, shouldn't dbaron's change in comment 6 be backed out? Doesn't look > like it was. setting needinfo for dbaron so that this don't get lost

(In reply to Robert O'Callahan (:roc) (Mozilla Corporation) from comment #7) > Backed out: > https://hg.mozilla.org/integration/mozilla-inbound/rev/148794d81e95 also landed on central as https://hg.mozilla.org/mozilla-central/rev/148794d81e95 (sorry again, my fault)

RyanVM backed it out.

I can't reproduce this on my Windows laptop, having tried various configurations. I'll try chaos mode to see if that helps.

https://hg.mozilla.org/integration/mozilla-inbound/rev/c6a7a027c126 https://hg.mozilla.org/integration/mozilla-inbound/rev/93265ade3bc9

https://hg.mozilla.org/mozilla-central/rev/c6a7a027c126 https://hg.mozilla.org/mozilla-central/rev/93265ade3bc9