Bug 217719

Summary: Scrolls in the passive event region only send one wheel event to the DOM
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: ScrollingAssignee: Simon Fraser (smfr) <simon.fraser>
Status: RESOLVED FIXED    
Severity: Normal CC: cmarcelo, ews-watchlist, fred.wang, jamesr, luiz, simon.fraser, thorton, tonikitoo, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=158439
Attachments:
Description Flags
Patch none

Simon Fraser (smfr)
Reported 2020-10-14 11:10:28 PDT
When the scrolling thread latches on a node (which might be in the passive event listener region), we should also store the processing steps and used them for latched scrolls. If we don't, then we would hit-test the layers again, and potentially get a different answer (breaking the rules of latching). Also latched scrolls need to use WheelEventProcessingSteps::MainThreadForDOMEventDispatch if in the passive region.
Attachments
Patch (18.72 KB, patch)
2020-10-15 11:11 PDT, Simon Fraser (smfr) 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2020-10-14 11:11:04 PDT
<rdar://problem/70300204>
Simon Fraser (smfr)
Comment 2 2020-10-15 11:11:13 PDT
Created attachment 411464 [details] Patch
EWS
Comment 3 2020-10-15 12:24:46 PDT
Committed r268544: <https://trac.webkit.org/changeset/268544> All reviewed patches have been landed. Closing bug and clearing flags on attachment 411464 [details].
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