[webkit-changes] [WebKit/WebKit] 7d680c: [scroll-anchoring] YouTube.com jittering in commen...

[Nikos Mouchtaris]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 7d680c19811737d2f07264bb02add5a612aca841
      https://github.com/WebKit/WebKit/commit/7d680c19811737d2f07264bb02add5a612aca841
  Author: Nikolaos Mouchtaris <nmouchtaris at apple.com>
  Date:   2023-12-13 (Wed, 13 Dec 2023)

  Changed paths:
    A LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/focused-element-in-excluded-subtree-expected.txt
    A LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/focused-element-in-excluded-subtree.html
    M Source/WebCore/page/scrolling/ScrollAnchoringController.cpp

  Log Message:
  -----------
  [scroll-anchoring] YouTube.com jittering in comments and Channel pages
https://bugs.webkit.org/show_bug.cgi?id=266303
rdar://problem/119568843

Reviewed by Simon Fraser.

We should check if a priority candidate is part of an excluded subtree before
selecting it as our anchor node.

* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/focused-element-in-excluded-subtree-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/focused-element-in-excluded-subtree.html: Added.
* Source/WebCore/page/scrolling/ScrollAnchoringController.cpp:
(WebCore::ScrollAnchoringController::didFindPriorityCandidate):

Canonical link: https://commits.webkit.org/271993@main