[Webkit-unassigned] [Bug 189663] REGRESSION (PSON): White or Black flash occurs when process swapping on navigation on Mac

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189663

--- Comment #23 from Antti Koivisto <koivisto at iki.fi> ---
> > Source/WebKit/UIProcess/WebPageProxy.cpp:2454
> > +            process().send(Messages::WebPage::SetIsSuspended(true), pageID());
> 
> I am wondering if we still need this IPC given that the WebProcess already
> gets a Policy decision IPC with PolicyAction::Suspend. Also, with your
> change, SetIsSuspended(true) IPC is sent twice to the process I believe.

The message from SuspendedPageProxy constructor comes too late (trip to runloop puts it after the policy delegate) as the page will have already transitioned to about:blank at that point. We need to tell the process immediately that it suspended so it knows to keep the layer tree frozen.

I didn't remove the second message as it was harmless but maybe I should.

> > Source/WebKit/mac/postprocess-framework-headers.sh:56
> > +        IOS_VERSION="12.0"
> 
> Why this change?

Build hack I forgot to remove.

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