[Webkit-unassigned] [Bug 244139] position: sticky element is not always re-painted on DOM update

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244139

--- Comment #7 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
We're computing a bad repaint rect, because the layoutDelta is moving the rect to a negative Y offset:

(lldb) p view().frameView().layoutContext().layoutDelta()
(WebCore::LayoutSize) $0 = { width = 0px (0), height = -57.6875px (-3692) }

(lldb) p dirtyRect
(WebCore::LayoutRect) $1 = { x = 0px (0), y = -47.6875px (-3052), width = 192px (12288), height = 28px (1792) }

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