[Webkit-unassigned] [Bug 192066] New: Wheel event propagation doesn't match other events

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192066

            Bug ID: 192066
           Summary: Wheel event propagation doesn't match other events
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Wheel event handling is funky. EventHandler::platformPrepareForWheelEvents starts by finding a target node with findEnclosingScrollableContainer() which looks up the ancestor DOM chain.

After finding a target node, handleWheelEventInAppropriateEnclosingBox() walks up the render containing block hierarchy looking for a scrollable parent to handle the event (with no hit-testing, so we can scroll things when over their border, for example). 

This causes confusion when we set up latching state, but fail to hit the scroller in the containing block tree walk that we saw in the DOM ancestor tree walk.

https://codepen.io/smfr/pen/rQZqxo

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