[webkit-changes] [WebKit/WebKit] a3c2ba: Accumulating offsets to handle fixed position cont...

[lericaa]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: a3c2ba9f9c71c4d54675a9d5ca88f0a739c0b967
      https://github.com/WebKit/WebKit/commit/a3c2ba9f9c71c4d54675a9d5ca88f0a739c0b967
  Author: Erica Li <lerica at apple.com>
  Date:   2024-01-17 (Wed, 17 Jan 2024)

  Changed paths:
    A LayoutTests/fast/block/positioning/fixed-position-transform-related-container-expected.txt
    A LayoutTests/fast/block/positioning/fixed-position-transform-related-container.html
    M Source/WebCore/rendering/RenderLayer.cpp

  Log Message:
  -----------
  Accumulating offsets to handle fixed position container has a transform-related property but not a transform.
https://bugs.webkit.org/show_bug.cgi?id=266976
rdar://120349843

Reviewed by Simon Fraser.

Referring chromium fix: https://codereview.chromium.org/1111423002

* LayoutTests/fast/block/positioning/fixed-position-transform-related-container-expected.txt: Added.
* LayoutTests/fast/block/positioning/fixed-position-transform-related-container.html: Added.
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::accumulateOffsetTowardsAncestor):

Canonical link: https://commits.webkit.org/273161@main