Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b72f845e52d9b27dc8a6cd67aed3215f59f56031
https://github.com/WebKit/WebKit/commit/b72f845e52d9b27dc8a6cd67aed3215f59f56031
Author: Simon Fraser <[email protected]>
Date: 2024-08-08 (Thu, 08 Aug 2024)
Changed paths:
A LayoutTests/fast/repaint/simplified-repaint-with-overflow-expected.txt
A LayoutTests/fast/repaint/simplified-repaint-with-overflow.html
M Source/WebCore/rendering/RenderLayer.cpp
Log Message:
-----------
REGRESSION (279847@main): Expanding threaded emails in Fastmail web UI
results in missing content, repaint artifacts, broken rendering
https://bugs.webkit.org/show_bug.cgi?id=277782
rdar://133344580
Reviewed by Tim Horton.
The optimization added in 279847@main caused us to skip repaints on a layer
which moved, when the movement is triggered by
layout on an ancestor layer. This caused repaint bugs on Google Sheets when
dragging rows, and Fastmail when collapsing
rows.
Fix by undoing the "simplified repaint" optimization on the descendant layers
of a layer with overflow, by removing the check for
the layer also having a transform.
* LayoutTests/fast/repaint/simplified-repaint-with-overflow-expected.txt: Added.
* LayoutTests/fast/repaint/simplified-repaint-with-overflow.html: Added.
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::RenderLayer::recursiveUpdateLayerPositions):
Canonical link: https://commits.webkit.org/281993@main
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