How do I take a “screenshot” of an NSView?

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From WWDC 2012 Session 245 (translated to Swift):

let viewToCapture = self.window!.contentView!
let rep = viewToCapture.bitmapImageRepForCachingDisplay(in: viewToCapture.bounds)!
viewToCapture.cacheDisplay(in: viewToCapture.bounds, to: rep)

let img = NSImage(size: viewToCapture.bounds.size)
img.addRepresentation(rep)

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