[Webkit-unassigned] [Bug 199488] WKWebView fails to render when another view uses CoreImage filters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199488

--- Comment #1 from Dan Saunders <dasau at microsoft.com> ---
I have debugged this more and found the cause of the regression, it seems the issue is that m_layerHostingMode is never set to LayerHostingMode::InProcess when CI filters are used. Previously the WebKit content process is already started when you add WKWebView to the window, so WebPageProxy::viewDidEnterWindow updates the layer hosting mode. With recent changes, WebPageProxy::dispatchActivityStateChange returns early because no process is started and the layer hosting mode is not set correctly. PageClientImpl::viewLayerHostingMode can get the correct value for the window, but it is just not set correctly on the content process in this scenario. CI filter forces in-proc rendering, WebKit will need to match the layer hosting mode of the window that is hosting it.

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