Confirmed regression range: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=eb592f79b7982217a439f7d32da52df9a40c334a&tochange=e8a29c8f1e095884077d52166404a854fba86280 Jeff or Miko, could you take a look here?
Bug 1740757 Comment 11 Edit History
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Confirmed the regression range, with the new testcase (my range matches the one at end of comment 7): https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=eb592f79b7982217a439f7d32da52df9a40c334a&tochange=e8a29c8f1e095884077d52166404a854fba86280 Reclassifying as WebRender, since this seems to be a bug in WebRender (or adjacent) painting code based on this regression range. Jeff or Miko, could you take a look here?