[webkit-changes] [WebKit/WebKit] 0cd807: [scroll-anchoring] Implement anchor node selection...

[Nikos Mouchtaris]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 0cd807347378c72b30ee428774daeaf2b04cff07
      https://github.com/WebKit/WebKit/commit/0cd807347378c72b30ee428774daeaf2b04cff07
  Author: Nikolaos Mouchtaris <nmouchtaris at apple.com>
  Date:   2023-09-22 (Fri, 22 Sep 2023)

  Changed paths:
    M LayoutTests/fast/repaint/absolute-position-changed.html
    M LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/descend-into-container-with-float-expected.txt
    M LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/exclude-fixed-position-expected.txt
    M LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/exclude-sticky-expected.txt
    M LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/position-change-heuristic-ib-split-expected.txt
    M LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/subtree-exclusion-expected.txt
    M Source/WebCore/page/scrolling/ScrollAnchoringController.cpp
    M Source/WebCore/page/scrolling/ScrollAnchoringController.h
    M Source/WebCore/platform/Logging.h

  Log Message:
  -----------
  [scroll-anchoring] Implement anchor node selection algorithm
https://bugs.webkit.org/show_bug.cgi?id=261628
rdar://115583079

Reviewed by Simon Fraser.

Implement anchor node selection algorithm outlined in the spec.

* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/descend-into-container-with-float-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/exclude-fixed-position-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/exclude-sticky-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/position-change-heuristic-ib-split-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-scroll-anchoring/subtree-exclusion-expected.txt:
* Source/WebCore/page/scrolling/ScrollAnchoringController.cpp:
(WebCore::anchorElementForPriorityCandidate):
(WebCore::elementIsScrollableArea):
(WebCore::ScrollAnchoringController::examinePriorityCandidate):
(WebCore::ScrollAnchoringController::findPriorityCandidate):
(WebCore::ScrollAnchoringController::examineCandidate):
(WebCore::operator<<):
(WebCore::ScrollAnchoringController::findAnchorElementRecursive):
(WebCore::ScrollAnchoringController::chooseAnchorElement):
(WebCore::ScrollAnchoringController::updateAnchorElement):
(WebCore::ScrollAnchoringController::adjustScrollPositionForAnchoring):
* Source/WebCore/page/scrolling/ScrollAnchoringController.h:

Canonical link: https://commits.webkit.org/268348@main