KeyboardLayoutConstraint + UIAlertController animation are broken [iOS 11]

[roma6125]

[roma6125]

Can be fixed by calling .layoutIfNeeded() on views from constraint items, instead of UIApplication.shared.keyWindow

func layoutViews() {
        for item in [firstItem, secondItem] {
            if let view = item as? UIView {
                view.layoutIfNeeded()
            }
            else if #available(iOS 9.0, *), let layoutGuide = item as? UILayoutGuide {
                layoutGuide.owningView?.layoutIfNeeded()
            }
        }
    }