Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 21426dee35a1783145f695ceed7defb1d464652e
      
https://github.com/WebKit/WebKit/commit/21426dee35a1783145f695ceed7defb1d464652e
  Author: Antti Koivisto <an...@apple.com>
  Date:   2024-04-15 (Mon, 15 Apr 2024)

  Changed paths:
    A 
LayoutTests/fast/block/positioning/simple-out-of-flow-percent-height-expected.html
    A LayoutTests/fast/block/positioning/simple-out-of-flow-percent-height.html
    M Source/WebCore/rendering/RenderBlockFlow.cpp

  Log Message:
  -----------
  REGRESSION(271848@main): "Watch later" checkbox on youtube.com mis-renders
https://bugs.webkit.org/show_bug.cgi?id=272665
rdar://125644808

Reviewed by Alan Baradlay.

Percent height out-of-flow positioned boxes taking the fast path may end up 
with miscomputed height.

* 
LayoutTests/fast/block/positioning/simple-out-of-flow-percent-height-expected.html:
 Added.
* LayoutTests/fast/block/positioning/simple-out-of-flow-percent-height.html: 
Added.
* Source/WebCore/rendering/RenderBlockFlow.cpp:
(WebCore::RenderBlockFlow::layoutModernLines):

Disable the out-of-flow fast path if there are percent height boxes. The 
problem is that the fast path
does a synchronous layout for these boxes before the height of the parent is 
computed.

The synchronous layout itself is a workaround but fixing it may be more 
complicated.

Canonical link: https://commits.webkit.org/277501@main



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