[Webkit-unassigned] [Bug 211430] New: Overlay scrollbar interaction in the sync scrolling region is broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211430

            Bug ID: 211430
           Summary: Overlay scrollbar interaction in the sync scrolling
                    region is broken
           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 ScrollingTreeGestureState logic only works if the scrolling tree is handling wheel events. If we send them the main thread, then we don't correctly match mayBegin/Canceled on overflow/subframe/overflow-in-subframe scrollers.

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