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WebKit interferes with smooth NSAnimation?

Subject: WebKit interferes with smooth NSAnimation?
From: Jim Correia <email@hidden>
Date: Sun, 16 Oct 2005 11:07:41 -0400
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I have a sample app where I am using NSAnimation to transition in a "shielding" window and a floating panel. I am testing on a dual 1.25GHz G4 with a ATI Radeon 9000 Pro graphics card.

The sample animates smoothly.

As soon as I had a Webview to the application[*] the animation starts sheering when fading in the shielding window.

(*) The webview doesn't even have to be in a window. Making one at startup and releasing it

    WebView *webview = [[WebView alloc] initWithFrame: NSZeroRect];
    [webview release];

is enough to trigger the problem.

Any idea what WebKit is doing that is causing things to shear on animate? Anything I can do to work around it?

Nothing obvious has leapt out when using Sampler or Shark to examine what is going on.

Thanks,
Jim
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