220056 2020-12-21 07:49:16 -0800 REGRESSION: Scroll snapping triggers body scroll 2020-12-23 10:52:50 -0800 1 1 1 Unclassified WebKit Scrolling Safari Technology Preview Mac (Intel) macOS 10.15 RESOLVED FIXED InRadar P2 Normal --- 1 augus.dupin simon.fraser augus.dupin sam simon.fraser smoley webkit-bug-importer wenson_hsieh oldest_to_newest 1716003 0 416602 augus.dupin 2020-12-21 07:49:16 -0800 Created attachment 416602 Test case Safari Technology Preview 117, on macOS 10.15.7 In a scroll container where scroll-snapping is enabled, a scroll gesture (followed by the snapping mechanism) causes the body to scroll as well in the same direction. See the attachment for a test case, also available here: https://output.jsbin.com/qewoyuraya Steps to reproduce: 1. Scroll vertically inside the yellow box with a trackpad You will see the body scroll vertically as well as soon as the snapping takes place. This is quite unexpected and problematic in some cases. I know this could be prevented by setting the body to overflow: hidden, but it is not always possible or desired. Note besides that scrolling programmatically the body in this case does not stop the scroll, as it should considering the revisions passed with STP 117. This problem was not present before STP 116, so this might be a regression due to the changes made on scrolling and scroll-snapping in STP 117. Possibly related to: - https://bugs.webkit.org/show_bug.cgi?id=219923 - https://bugs.webkit.org/show_bug.cgi?id=219960 which also appeared in STP 117. 1716301 1 smoley 2020-12-22 11:59:32 -0800 Thanks for filing. I'm not sure about the regression status as I can reproduce this on Safari 13.1.3 as well as STP 117 (14.1). 1716302 2 webkit-bug-importer 2020-12-22 11:59:43 -0800 <rdar://problem/72595482> 1716308 3 augus.dupin 2020-12-22 12:09:49 -0800 Yes, that's right I can too. However, I'm pretty sure it was not the case in STP 115 (I don't know about 116, I didn't test it). 1716317 4 simon.fraser 2020-12-22 12:31:38 -0800 Latching isn't working correctly; with scroll snap we fail to tell ScrollingTreeLatchingController that we've received events, so the latch times out. 1716355 5 simon.fraser 2020-12-22 13:33:02 -0800 This might be: if (processWheelEventForScrollSnap(wheelEvent)) return false; // FIXME: Why don't we report that we handled it? 1716377 6 416694 simon.fraser 2020-12-22 14:32:26 -0800 Created attachment 416694 Patch 1716381 7 416694 sam 2020-12-22 15:04:54 -0800 Comment on attachment 416694 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=416694&action=review > Source/WebCore/platform/cocoa/ScrollController.h:172 > bool processWheelEventForScrollSnap(const PlatformWheelEvent&); Not for this change obviously, but maybe it's time to replace these boolean return values with something a bit more expressive. 1716383 8 simon.fraser 2020-12-22 15:06:44 -0800 Yeah, I spent 5 minutes trying to think of an enum name and failed. We need this handled/unhandled enum more extensively. 1716476 9 simon.fraser 2020-12-23 10:52:50 -0800 https://trac.webkit.org/r271072 416602 2020-12-21 07:49:16 -0800 2020-12-21 07:49:16 -0800 Test case snapping_triggers_body.html text/html 1890 augus.dupin PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KICAgIDxoZWFkPgogICAgICAgIDxtZXRh IGNoYXJzZXQ9IlVURi04IiAvPgogICAgICAgIDxtZXRhIG5hbWU9InZpZXdwb3J0IiBjb250ZW50 PSJ3aWR0aD1kZXZpY2Utd2lkdGgsIGluaXRpYWwtc2NhbGU9MS4wIiAvPgogICAgICAgIDx0aXRs ZT5TY3JvbGwgcHJvcGFnYXRpb24gdG8gYm9keSB3aXRoIHNjcm9sbC1zbmFwPC90aXRsZT4KICAg ICAgICA8c3R5bGU+CiAgICAgICAgICAgICogewogICAgICAgICAgICAgICAgYm94LXNpemluZzog Ym9yZGVyLWJveDsKICAgICAgICAgICAgfQogICAgICAgICAgICBib2R5IHsKICAgICAgICAgICAg ICAgIG1hcmdpbjogMDsKICAgICAgICAgICAgfQoKICAgICAgICAgICAgLmNvbnRlbnQgewogICAg ICAgICAgICAgICAgd2lkdGg6IDEwMCU7CiAgICAgICAgICAgICAgICBtaW4taGVpZ2h0OiAyMDB2 aDsKICAgICAgICAgICAgICAgIGJhY2tncm91bmQtaW1hZ2U6IGxpbmVhci1ncmFkaWVudCgjZTY2 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