[Webkit-unassigned] [Bug 195710] Possibly explicitly trigger compositing for layers that need to be moved by ScrollingTreePositionedNodes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195710

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Created attachment 364611

  --> https://bugs.webkit.org/attachment.cgi?id=364611&action=review

Testcase that needs this

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