[webkit-changes] [WebKit/WebKit] bd33a8: Incorrect wheel event behavior with Shadow DOM

[Simon Fraser]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: bd33a8e97f273f32b0034c9fed1f7ce52b460393
      https://github.com/WebKit/WebKit/commit/bd33a8e97f273f32b0034c9fed1f7ce52b460393
  Author: Simon Fraser <simon.fraser at apple.com>
  Date:   2024-01-18 (Thu, 18 Jan 2024)

  Changed paths:
    A LayoutTests/fast/scrolling/mac/wheel-event-in-overflow-with-shadow-dom-expected.txt
    A LayoutTests/fast/scrolling/mac/wheel-event-in-overflow-with-shadow-dom.html
    M Source/WebCore/page/mac/EventHandlerMac.mm

  Log Message:
  -----------
  Incorrect wheel event behavior with Shadow DOM
https://bugs.webkit.org/show_bug.cgi?id=264469
rdar://118496293

Reviewed by Ryosuke Niwa and Chris Dumez.

`findEnclosingScrollableContainer()` needs to use `parentInComposedTree()` to find the enclosing
ScrollableArea for the overflow scroll.

* LayoutTests/fast/scrolling/mac/wheel-event-in-overflow-with-shadow-dom-expected.txt: Added.
* LayoutTests/fast/scrolling/mac/wheel-event-in-overflow-with-shadow-dom.html: Added.
* Source/WebCore/page/mac/EventHandlerMac.mm:
(WebCore::findEnclosingScrollableContainer):

Canonical link: https://commits.webkit.org/273181@main