Remove alpha transparency from NSImage

NSImage + withoutAlpha.swift

extension NSImage { 
  

func withoutAlpha() -> NSImage? {
        // based on https://gist.github.com/mishimay/7b65167cf829e022f46dfa749d018661
        guard let cgImage = self.cgImage(forProposedRect: nil, context: nil, hints: nil) else { return nil }
        let context = CGContext(data: nil, width: cgImage.width, height: cgImage.height, bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: cgImage.bytesPerRow, space: cgImage.colorSpace!, bitmapInfo: CGImageAlphaInfo.noneSkipLast.rawValue)!
        context.draw(cgImage, in: CGRect(x: 0, y: 0, width: context.width, height: context.height))
        guard let newCg = context.makeImage() else { return nil }
        return NSImage(cgImage: newCg, size: .zero)
    }
  
}