Bug 1201327 caused a bunch of regressions (bug 1227327, bug 1227012, bug 1239856) and I won't be able to fix them in time for Firefox 45. So we should back out bug 1201327 on Beta. (I do have a plan for fixing it, and I'm confident about landing the real fix in time for Firefox 46.)
Approval Request Comment [Feature/regressing bug #]: bug 1201327 [User impact if declined]: painting wrong images on some sites (not respecting changes to background-position) [Describe test coverage new/current, TreeHerder]: this was just an optimization, test coverage is fairly good [Risks and why]: very low, just a backout [String/UUID change made/needed]: none
Attachment #8713767 - Flags: approval-mozilla-beta?
Comment on attachment 8713767 [details] [diff] [review] beta backout OK; let's back out it. Should be in 45 beta 2.
Attachment #8713767 - Flags: approval-mozilla-beta? → approval-mozilla-beta+
I've landed the backout on Aurora 47, too: https://hg.mozilla.org/releases/mozilla-aurora/rev/f3a938f7ab1d Approval for that was given in bug 1201327 comment 28.
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