Bug 211430 - Overlay scrollbar interaction in the sync scrolling region is broken
Summary: Overlay scrollbar interaction in the sync scrolling region is broken
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Scrolling (show other bugs)
Version: Safari Technology Preview
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-05-04 20:52 PDT by Simon Fraser (smfr)
Modified: 2020-05-04 20:54 PDT (History)
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Description Simon Fraser (smfr) 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.