[Webkit-unassigned] [Bug 140560] Paint order problem scrolling a relative-position element over a fixed-position element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140560

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
This happens because our compositing overlap testing isn't re-run on scrolling, and doesn't account for the fact that scrolling will "smear" the fixed thing down the page.

One way to fix this would be for the compositing overlap code to compute a "smeared" rect for the fixed thing.

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