[Webkit-unassigned] [Bug 258741] New: REGRESSION (263995 at main): preventDefault on wheel events can still result in page scrolling (fast/scrolling/mac/event-region-prevent-default-with-sublayer.html is a consistent failure)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258741

            Bug ID: 258741
           Summary: REGRESSION (263995 at main): preventDefault on wheel
                    events can still result in page scrolling
                    (fast/scrolling/mac/event-region-prevent-default-with-
                    sublayer.html is a consistent failure)
           Product: WebKit
           Version: WebKit Local Build
          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
                CC: simon.fraser at apple.com

After 263995 at main, if the page calls preventDefault() on the first wheel event, we'd still think the page was just unresponsive, and convert the synchronous wheel event sequent into an async one.

This resulted in scrolling jiggles on pages with embedded maps that wanted to consume the wheel events for scrolling.

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