[Webkit-unassigned] [Bug 217719] New: Latching on the scrolling thread should also store the processing steps

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217719

            Bug ID: 217719
           Summary: Latching on the scrolling thread should also store the
                    processing steps
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

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.

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