[Webkit-unassigned] [Bug 195879] Assertion failure !isInAcceleratedCompositingMode() in DrawingAreaProxyCoordinatedGraphics::incorporateUpdate when forceCompositingMode is turned on

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195879

--- Comment #7 from Tomoki Imai <Tomoki.Imai at sony.com> ---
Comment on attachment 365008
  --> https://bugs.webkit.org/attachment.cgi?id=365008
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=365008&action=review

> Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.cpp:79
> +    if (isInAcceleratedCompositingMode() || alwaysUseCompositing())

I think we shouldn't have " || alwaysUseCompositing()" here for the same reason as webkitWebViewBaseDraw. If it's transitioning to AC mode, we should update BackingStore.

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