211374 2020-05-04 03:42:27 -0700 REGRESSION(r260571): RequestedScrollPosition doesn't have its scroll change applied to layers anymore 2020-05-13 07:43:13 -0700 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 zan zan cgarcia cmarcelo ews-watchlist gyuyoung.kim koivisto luiz noam ryuan.choi sergio simon.fraser webkit-bug-importer zeno oldest_to_newest 1648496 0 zan 2020-05-04 03:42:27 -0700 After r260571, in the Nicosia scrolling mechanisms, scrolling changes applied onto the main-frame scrolling nodes through the RequestedScrollPosition state property change don't have any effect anymore. I assume this problem isn't exhibited on Mac/iOS. https://trac.webkit.org/changeset/260571/webkit This leaves the RequestedScrollPosition state changes to have no effect on the positioning of the layers, ergo scrolling via scrollbars or keyboard does not behave correctly. A call to applyLayerPositionsInternal() at the end of the ScrollingTree::commitTreeState() would for instance restore the correct behavior. 1648573 1 simon.fraser 2020-05-04 09:40:46 -0700 This is because of me juggling which when layer positions are applied. Layer positions should be getting applied at the end of the rendering updates; on macOS this happens in Page::finalizeRenderingUpdate(). 1652186 2 zan 2020-05-13 05:52:18 -0700 (In reply to Simon Fraser (smfr) from comment #1) > This is because of me juggling which when layer positions are applied. > > Layer positions should be getting applied at the end of the rendering > updates; on macOS this happens in Page::finalizeRenderingUpdate(). That's what's needed, thanks for the tip. 1652190 3 399254 zan 2020-05-13 05:57:58 -0700 Created attachment 399254 Patch 1652191 4 399254 cgarcia 2020-05-13 06:00:23 -0700 Comment on attachment 399254 Patch Thanks! 1652226 5 399254 zan 2020-05-13 07:42:48 -0700 Comment on attachment 399254 Patch Clearing flags on attachment: 399254 Committed r261616: <https://trac.webkit.org/changeset/261616> 1652227 6 zan 2020-05-13 07:42:52 -0700 All reviewed patches have been landed. Closing bug. 1652228 7 webkit-bug-importer 2020-05-13 07:43:13 -0700 <rdar://problem/63183761> 399254 2020-05-13 05:57:58 -0700 2020-05-13 07:42:48 -0700 Patch bug-211374-20200513145757.patch text/plain 4231 zan U3VidmVyc2lvbiBSZXZpc2lvbjogMjYxNjA4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDhiNWFjZWUxOTFmMjE3YjI0 NWM2ODFiZDQxZjUwZGU2NDAyNGViNDIuLjUzOTllYmFlZGI0ZWQ3NWE4YzYyZjA1NjQzZjgyNTYw ZjBhNGM1MDUgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMjkgQEAKKzIwMjAtMDUtMTMgIFphbiBEb2Jl cnNlayAgPHpkb2JlcnNla0BpZ2FsaWEuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04ocjI2MDU3 MSk6IFJlcXVlc3RlZFNjcm9sbFBvc2l0aW9uIGRvZXNuJ3QgaGF2ZSBpdHMgc2Nyb2xsIGNoYW5n ZSBhcHBsaWVkIHRvIGxheWVycyBhbnltb3JlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQu b3JnL3Nob3dfYnVnLmNnaT9pZD0yMTEzNzQKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg KE9PUFMhKS4KKworICAgICAgICBVc2UgV2ViUGFnZTo6ZmluYWxpemVSZW5kZXJpbmdVcGRhdGUo 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