[webkit-changes] [WebKit/WebKit] 47fe29: REGRESSION (279847 at main): Rendering is broken afte...

[Alan Baradlay]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 47fe298829ac629f561518641b7e6bc4069cb09b
      https://github.com/WebKit/WebKit/commit/47fe298829ac629f561518641b7e6bc4069cb09b
  Author: Alan Baradlay <zalan at apple.com>
  Date:   2024-06-26 (Wed, 26 Jun 2024)

  Changed paths:
    A LayoutTests/fast/repaint/simplified-layout-with-descendant-overflow-fails-expected.txt
    A LayoutTests/fast/repaint/simplified-layout-with-descendant-overflow-fails.html
    M Source/WebCore/rendering/RenderLayer.cpp

  Log Message:
  -----------
  REGRESSION (279847 at main): Rendering is broken after scrolling on build result page
https://bugs.webkit.org/show_bug.cgi?id=275866
<rdar://130055235>

Reviewed by Simon Fraser.

In 279847 at main we made an incorrect assumption that ancestor layers would take care of repainting their overflowing descendants.
This patch disables canUseSimplifiedRepaintPass for such subtrees with transform.

* LayoutTests/fast/repaint/simplified-layout-with-descendant-overflow-fails-expected.txt: Added.
* LayoutTests/fast/repaint/simplified-layout-with-descendant-overflow-fails.html: Added.
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::RenderLayer::recursiveUpdateLayerPositions):

Canonical link: https://commits.webkit.org/280406@main



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