Okay, so, here's the solution … The problem was in this …

Wrong way

I was listening for contentView frame changes 
(NSViewDidChangeFrameNotification) and I was calling display/invalidateShadow 
whenever I receieved this notification.

Correct way

NSWindowDelegate has windowDidResize notification. I moved 
display/invalidateShadow there and it stops flickering and works perfectly now.

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