Summary: Find and fix the underlying cause for intermittent failure in Bug 1295466 and revert the patch here that uses MozReftestInvalidate event to temporarily hide this intermittent failure. → box-sizing-replaced-001.xht is missing 1/3 of a scaled image, if reftest snapshot fires before first paint
As part of this bug, we also need to revert the patch landed in Bug 1295466 that uses MozReftestInvalidate event to stop the test-failure from showing up when reducing paint delay.
Update: we rolled back the change described in Comment 1 and we instead added an extremely-permissive "fuzzy" annotation, here: https://hg.mozilla.org/integration/autoland/rev/c46aadcf745c#l2.12 So now, when this bug is fixed, we'll want to make the following changes on top of the patches that landed in bug 1295466 comment 46: (1) Remove that ^^ fuzzy annotation when this bug is fixed (2) Backout https://hg.mozilla.org/integration/autoland/rev/faa9981549a6 (i.e. remove the duplicate files that we created there, since they only exist to allow us to run a version of this test with a Mozilla-specific "MozReftestInvalidate" hackaround)
I think the test failures in bug 1295466 are caused by this same underlying issue, too. (At least, the failure snapshots look similar, with the right chunk of a scaled image missing. E.g. in https://treeherder.mozilla.org/logviewer.html#?repo=mozilla-inbound&job_id=75524537&lineNumber=30184 )
Summary: box-sizing-replaced-001.xht is missing 1/3 of a scaled image, if reftest snapshot fires before first paint → box-sizing-replaced-001.xht and box-sizing-replaced-002.xht are missing part of a scaled image, if reftest snapshot fires before first paint
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