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window shadow and setAlphaValue bug?

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window shadow and setAlphaValue bug?

Subject: window shadow and setAlphaValue bug?
From: Ivan Kourtev <email@hidden>
Date: Sun, 19 Nov 2006 16:11:20 -0500

Why is it that if a window has NO shadow and the window's alpha value is set (via - [NSWindow setAlphaValue:]) to a value different from 1.0, a window shadow is now rendered to the screen? I tried creating the window programmatically or in IB, I tried invalidateShadow after the setAlphaValue calls, nothing works.

What's even more confusing to me is that - [NSWindow hasShadow] continues to return NO after the shadow has appeared.

I searched all window documentation and didn't find any mention of this being documented behavior. Is anyone aware of why this is happening and any possible workarounds (setting alpha back to 1.0 helps to eliminate the shadow but I really need windows with different alpha values).

Thanks,

-- ivan

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