NEW 211430
Overlay scrollbar interaction in the sync scrolling region is broken 
https://bugs.webkit.org/show_bug.cgi?id=211430
Summary Overlay scrollbar interaction in the sync scrolling region is broken
Simon Fraser (smfr)
Reported 2020-05-04 20:52:33 PDT
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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