[Webkit-unassigned] [Bug 217718] New: Scrolls in the passive handler region should be reported as handled promptly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217718

            Bug ID: 217718
           Summary: Scrolls in the passive handler region should be
                    reported as handled promptly
           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

The WebContent process reports back to the UI process when events are handled (and for wheel events this is used to know if the page overrode history swipes, for example).

When handling wheel events in the passive event handler region, we should report that the scrolls are handled promptly to avoid the UI process queueing up events, which impacts scrolling performance.

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