208972 2020-03-11 20:21:44 -0700 REGRESSION (r254054): finance.google.com watch list renders initially then disappears for 5+ seconds before reappearing 2020-03-12 10:15:55 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 simon.fraser simon.fraser esprehn+autocc ews-watchlist glenn graouts kondapallykalyan mjs pdr simon.fraser webkit-bug-importer zalan oldest_to_newest 1629009 0 simon.fraser 2020-03-11 20:21:44 -0700 REGRESSION (r254054): finance.google.com watch list renders initially then disappears for 5+ seconds before reappearing 1629013 1 393333 simon.fraser 2020-03-11 20:29:09 -0700 Created attachment 393333 Patch 1629016 2 393333 zalan 2020-03-11 20:33:50 -0700 Comment on attachment 393333 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=393333&action=review > Source/WebCore/rendering/style/RenderStyle.cpp:822 > + if (m_boxData->hasAutoUsedZIndex() != other.m_boxData->hasAutoUsedZIndex()) > + return true; It's a bit odd though that z-index change needs layout (and visual overflow computation as well. LFC should be better at this.) 1629051 3 mjs 2020-03-11 22:17:02 -0700 Are the bot failures real? 1629052 4 mjs 2020-03-11 22:18:18 -0700 WK1 and WK2 both showing css3/blending/repaint/blend-mode-isolate-stacking-context.html as failing, sounds possibly caused by this bug. 1629059 5 simon.fraser 2020-03-11 22:54:49 -0700 (In reply to Maciej Stachowiak from comment #4) > WK1 and WK2 both showing > css3/blending/repaint/blend-mode-isolate-stacking-context.html as failing, > sounds possibly caused by this bug. Changes in the order of repaints, which is not surprising. I'll verify that the rendering is correct, and rebaseline. 1629085 6 graouts 2020-03-12 01:01:27 -0700 <rdar://problem/59727171> 1629235 7 simon.fraser 2020-03-12 10:15:55 -0700 https://trac.webkit.org/changeset/258336/webkit 393333 2020-03-11 20:29:09 -0700 2020-03-11 20:31:42 -0700 Patch bug-208972-20200311202908.patch text/plain 8036 simon.fraser U3VidmVyc2lvbiBSZXZpc2lvbjogMjU4MjI5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZTIxYzE4NTgzZGVkMmJh Y2I3NjMzM2MxMTQwZDVlYjNjZWM2ZDU0Ny4uNWEzZWZmMjEwMDJhYmEwZmRmMzVlOTRmYzdiNmFh NmQ0MTJkM2ZkOCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDMxIEBACisyMDIwLTAzLTExICBTaW1v biBGcmFzZXIgIDxzaW1vbi5mcmFzZXJAYXBwbGUuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04g KHIyNTQwNTQpOiBmaW5hbmNlLmdvb2dsZS5jb20gd2F0Y2ggbGlzdCByZW5kZXJzIGluaXRpYWxs eSB0aGVuIGRpc2FwcGVhcnMgZm9yIDUrIHNlY29uZHMgYmVmb3JlIHJlYXBwZWFyaW5nCisgICAg 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