[Webkit-unassigned] [Bug 190500] Bad behavior of scrolling, position:fixed inside flattened iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190500

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Even with frame flattening off, I see two issues with this test content on iPad:
1. On first load, the position:fixed in the iframe is missing
2. After scrolling the iframe for a bit, we lose all the tiles in the logging element.

My guess is that GraphicsLayer geometry isn't getting updated somehow, triggering incorrect visible rects. Maybe this is related to boundsOrigin vs. position differences.

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