Swift - stop truncating UIButton titleLabel - swift

Question

I have the following UIButton defined:
internal lazy var volumeUnitSelector: DropDownButton = {
let button = DropDownButton()
button.setTitle("impg", for: .normal)
button.setTitleColor(UIColor.darkGreyWithDarkMode.withAlphaComponent(0.7), for: .normal)
button.titleLabel?.font = .systemFont(ofSize: 14)
button.titleLabel?.textAlignment = .right
if #available(iOS 13.0, *) {
let config = UIImage.SymbolConfiguration(pointSize: 8, weight: .black)
let symbol = UIImage(systemName: "arrowtriangle.down.fill", withConfiguration: config)?.withTintColor(UIColor.darkGreyWithDarkMode, renderingMode: .alwaysOriginal)
button.setImage(symbol, for: .normal)
}
return button
}()
And here is the DropDownButton class which subclasses UIButton:
class DropDownButton: UIButton {
override func layoutSubviews() {
self.titleEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: 0.0, right: 9)
super.layoutSubviews()
if imageView != nil {
imageView?.translatesAutoresizingMaskIntoConstraints = false
imageView?.rightAnchor.constraint(equalTo: rightAnchor).isActive = true
imageView?.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
self.widthAnchor.constraint(equalToConstant: 43).isActive = true
}
}
}
Here's the challenge - I'm trying to set this button to have the text 'impg' and then an arrow to indicate a drop down menu to the right of the text. So as you can see, I've added the arrow as an SFSymbol and pinned it to the right of the button. I then need me text to be essentially pinned to the leadingAnchor of the arrow image, with a small margin (0.5 / 1 point).
So, I've set the titleEdgeInset to 9 on the right hand side to make room for the image. Now this is kind of working, but what I don't understand is that my title is being clipped, when there should be plenty of room for it.
Here is the current effect it has:
And here is the xCode layout view:
I don't understand why there's not enough space here to the left of the text to expand into. I have no other constraints set.