[Webkit-unassigned] [Bug 214035] [GTK][WinCairo] position:fixed layers are unnecessarily repainted by scrolling main content layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214035

--- Comment #3 from Fujii Hironori <Hironori.Fujii at sony.com> ---
DrawingAreaCoordinatedGraphics::updatePreferences is enabling settings.setAcceleratedCompositingForFixedPositionEnabled if acceleratedCompositingEnabled.
https://trac.webkit.org/browser/webkit/trunk/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/DrawingAreaCoordinatedGraphics.cpp?rev=263259#L251

>     // Fixed position elements need to be composited and create stacking contexts
>     // in order to be scrolled by the ScrollingCoordinator.
>     settings.setAcceleratedCompositingForFixedPositionEnabled(settings.acceleratedCompositingEnabled());


This code was added by
Bug 154100 – [ThreadedCompositor] position:fixed elements do not have their own layers when threaded compositor is enabled.

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