[webkit-changes] [WebKit/WebKit] 0f4cd6: css/filter-effects/backdrop-filter-containing-bloc...

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 0f4cd6871883de54429c34b5e162609d0c1c2005
      https://github.com/WebKit/WebKit/commit/0f4cd6871883de54429c34b5e162609d0c1c2005
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2023-09-19 (Tue, 19 Sep 2023)

  Changed paths:
    M LayoutTests/TestExpectations
    M Source/WebCore/rendering/RenderElement.cpp
    M Source/WebCore/rendering/RenderElementInlines.h
    M Source/WebCore/rendering/style/WillChangeData.cpp
    M Source/WebCore/rendering/style/WillChangeData.h

  Log Message:
  -----------
  css/filter-effects/backdrop-filter-containing-block.html fails because backdrop-filter doesn't create a containing block.
https://bugs.webkit.org/show_bug.cgi?id=261662
<rdar://115638583>

Reviewed by Simon Fraser.

Backdrop-filter should establish a containing block for absolute and fixed position descendants, except if it's on the root element.

* LayoutTests/TestExpectations:
* Source/WebCore/rendering/RenderElement.cpp:
(WebCore::RenderElement::adjustFragmentedFlowStateOnContainingBlockChangeIfNeeded):
* Source/WebCore/rendering/RenderElementInlines.h:
(WebCore::RenderElement::canContainAbsolutelyPositionedObjects const):
(WebCore::RenderElement::canContainFixedPositionObjects const):
* Source/WebCore/rendering/style/WillChangeData.cpp:
(WebCore::WillChangeData::createsContainingBlockForAbsolutelyPositioned const):
(WebCore::WillChangeData::createsContainingBlockForOutOfFlowPositioned const):
* Source/WebCore/rendering/style/WillChangeData.h:

Canonical link: https://commits.webkit.org/268161@main