[Webkit-unassigned] [Bug 225467] REGRESSION (Safari 14): Submenus on https://codelearn.cat don't show

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225467

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
This might be fallout from the RenderLayer/ScrollableArea split.

There's a composited layer with overflow:scroll, and overflow is being toggled to 'visible'. We fail to remove the compositing clipping layer, so the content remains clipped.

This is happening because RenderBox::requiresLayerWithScrollableArea() is called from RenderLayer::styleChanged() (i.e. before layout) but it consults hasHorizontalOverflow() || hasVerticalOverflow() which depend on layout.

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