217850 2020-10-16 15:20:57 -0700 [WinCairo] sluggish page scrolling for wheel events since r268499 2020-10-18 22:19:18 -0700 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 fujii fujii simon.fraser webkit-bug-importer oldest_to_newest 1698780 0 fujii 2020-10-16 15:20:57 -0700 [WinCairo] sluggish page scrolling even in non-AC mode 1. Start WinCairo MiniBrowser 2. Go to https://trac.webkit.org/wiki 3. scroll down by mouse wheel r267199 (with WebKitRequirements v2020.08.20): smooth scrolling r268564 (with WebKitRequirements v2020.10.04): sluggish scrolling 1698866 1 simon.fraser 2020-10-16 19:44:59 -0700 Test around r268287, r268417, r268476, r268499. 1699121 2 fujii 2020-10-18 13:08:56 -0700 It's a very useful information for bisecting. Thank you. r268498 : smooth scrolling r268499 : sluggish scrolling This issue has been started since r268499. 1699130 3 411718 fujii 2020-10-18 13:58:05 -0700 Created attachment 411718 Patch 1699131 4 fujii 2020-10-18 13:59:05 -0700 I don't understand this change, but I confirmed this patch fixes the WinCairo issue. 1699195 5 411718 fujii 2020-10-18 22:18:43 -0700 Comment on attachment 411718 Patch Clearing flags on attachment: 411718 Committed r268664: <https://trac.webkit.org/changeset/268664> 1699196 6 fujii 2020-10-18 22:18:46 -0700 All reviewed patches have been landed. Closing bug. 1699197 7 webkit-bug-importer 2020-10-18 22:19:18 -0700 <rdar://problem/70427879> 411718 2020-10-18 13:58:05 -0700 2020-10-18 22:18:43 -0700 Patch bug-217850-20201019055804.patch text/plain 1788 fujii U3VidmVyc2lvbiBSZXZpc2lvbjogMjY4NjYwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDUxMmM3ZDI1NzhjMWViNzgx Mjg2NTFiNjJiMzFhNzM5NmFhMjczMWIuLjk0ZGU1ZDZjMjI4ZjRiNmU5YzQ2ZTUwN2ZjZjg5MGU3 ZGNjMjk4NTAgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTUgQEAKKzIwMjAtMTAtMTggIEZ1amlpIEhp cm9ub3JpICA8SGlyb25vcmkuRnVqaWlAc29ueS5jb20+CisKKyAgICAgICAgW1dpbkNhaXJvXSBz bHVnZ2lzaCBwYWdlIHNjcm9sbGluZyBmb3Igd2hlZWwgZXZlbnRzIHNpbmNlIHIyNjg0OTkKKyAg ICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIxNzg1MAorCisg ICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgICogV2ViUHJvY2Vz cy9XZWJQYWdlL0V2ZW50RGlzcGF0Y2hlci5jcHA6CisgICAgICAgIChXZWJLaXQ6OkV2ZW50RGlz cGF0Y2hlcjo6d2hlZWxFdmVudCk6IEluY2x1ZGUKKyAgICAgICAgV2hlZWxFdmVudFByb2Nlc3Np bmdTdGVwczo6TWFpblRocmVhZEZvclNjcm9sbGluZyB0bworICAgICAgICBwcm9jZXNzaW5nU3Rl cHMgZm9yICFFTkFCTEUoU0NST0xMSU5HX1RIUkVBRCkuCisKIDIwMjAtMTAtMTcgIERhdmlkIEtp bHplciAgPGRka2lsemVyQGFwcGxlLmNvbT4KIAogICAgICAgICBSRUdSRVNTSU9OIChyMTkxNjM3 KTogRml4IC1XbWlzbGVhZGluZy1pbmRlbnRhdGlvbiB3YXJuaW5ncyBpbiBvcGVuIHNvdXJjZSBj bGFuZwpkaWZmIC0tZ2l0IGEvU291cmNlL1dlYktpdC9XZWJQcm9jZXNzL1dlYlBhZ2UvRXZlbnRE aXNwYXRjaGVyLmNwcCBiL1NvdXJjZS9XZWJLaXQvV2ViUHJvY2Vzcy9XZWJQYWdlL0V2ZW50RGlz cGF0Y2hlci5jcHAKaW5kZXggZjc2NDMwNjA0YmNhZTQ0NjUwNjhlOTVjMTNjNTBlMjYxNGQ5YTYw MC4uYzFlODFkMGYzNTVlMzI4MjdlMjNhMzJlNjQ1YTYzMGYzYWE1ZmMxNCAxMDA2NDQKLS0tIGEv U291cmNlL1dlYktpdC9XZWJQcm9jZXNzL1dlYlBhZ2UvRXZlbnREaXNwYXRjaGVyLmNwcAorKysg Yi9Tb3VyY2UvV2ViS2l0L1dlYlByb2Nlc3MvV2ViUGFnZS9FdmVudERpc3BhdGNoZXIuY3BwCkBA IC0xMjEsNyArMTIxLDcgQEAgdm9pZCBFdmVudERpc3BhdGNoZXI6OndoZWVsRXZlbnQoUGFnZUlk ZW50aWZpZXIgcGFnZUlELCBjb25zdCBXZWJXaGVlbEV2ZW50JiB3aGUKICAgICB9CiAjZW5kaWYK IAotICAgIGF1dG8gcHJvY2Vzc2luZ1N0ZXBzID0gT3B0aW9uU2V0PFdlYkNvcmU6OldoZWVsRXZl bnRQcm9jZXNzaW5nU3RlcHM+IHsgV2hlZWxFdmVudFByb2Nlc3NpbmdTdGVwczo6TWFpblRocmVh ZEZvckRPTUV2ZW50RGlzcGF0Y2ggfTsKKyAgICBhdXRvIHByb2Nlc3NpbmdTdGVwcyA9IE9wdGlv blNldDxXZWJDb3JlOjpXaGVlbEV2ZW50UHJvY2Vzc2luZ1N0ZXBzPiB7IFdoZWVsRXZlbnRQcm9j ZXNzaW5nU3RlcHM6Ok1haW5UaHJlYWRGb3JTY3JvbGxpbmcsIFdoZWVsRXZlbnRQcm9jZXNzaW5n U3RlcHM6Ok1haW5UaHJlYWRGb3JET01FdmVudERpc3BhdGNoIH07CiAjaWYgRU5BQkxFKFNDUk9M TElOR19USFJFQUQpCiAgICAgcHJvY2Vzc2luZ1N0ZXBzID0gWyZdKCkgLT4gT3B0aW9uU2V0PFdo ZWVsRXZlbnRQcm9jZXNzaW5nU3RlcHM+IHsKICAgICAgICAgTG9ja0hvbGRlciBsb2NrZXIobV9z Y3JvbGxpbmdUcmVlc011dGV4KTsK