[webkit-changes] [WebKit/WebKit] 79c73a: REGRESSION (iPadOS 18): RemoteScrollingCoordinator...

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 79c73a5e0996c9147a5389341d51641e05e1b455
      https://github.com/WebKit/WebKit/commit/79c73a5e0996c9147a5389341d51641e05e1b455
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2025-01-29 (Wed, 29 Jan 2025)

  Changed paths:
    A LayoutTests/compositing/scrolling/scroller-inside-hidden-layer-expected.html
    A LayoutTests/compositing/scrolling/scroller-inside-hidden-layer.html
    M LayoutTests/compositing/visibility/visibility-image-layers-dynamic-composited-expected.txt
    M LayoutTests/platform/glib/compositing/visibility/visibility-image-layers-dynamic-composited-expected.txt
    M LayoutTests/platform/glib/fast/layers/layer-visibility-expected.txt
    M LayoutTests/platform/ios/compositing/visibility/visibility-image-layers-dynamic-composited-expected.txt
    M LayoutTests/platform/ios/fast/layers/layer-visibility-expected.txt
    M LayoutTests/platform/mac/fast/layers/layer-visibility-expected.txt
    M Source/WebCore/rendering/RenderLayer.cpp
    M Source/WebCore/rendering/RenderLayerScrollableArea.cpp

  Log Message:
  -----------
  REGRESSION (iPadOS 18): RemoteScrollingCoordinatorProxyIOS Invalid message dispatched virtual void WebKit::RemoteScrollingCoordinatorProxyIOS::establishLayerTreeScrollingRelations.
https://bugs.webkit.org/show_bug.cgi?id=286356
<rdar://problem/143435840>

Reviewed by Simon Fraser.

layerOrDescendantsAreVisible should not depend on being a stacking context,
positioned layers can have normal-flow children layers that are visible and
require the hidden container to be included in the tree.

* LayoutTests/compositing/scrolling/scroller-inside-hidden-layer-expected.html: Added.
* LayoutTests/compositing/scrolling/scroller-inside-hidden-layer.html: Added.
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::RenderLayer::collectLayers):
* Source/WebCore/rendering/RenderLayerScrollableArea.cpp:
(WebCore::RenderLayerScrollableArea::computeHasCompositedScrollableOverflow):

Canonical link: https://commits.webkit.org/289527@main



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