How to change caret color of NSTextField in macOS

Issue #588

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class FocusAwareTextField: NSTextField {
var onFocus: () -> Void = {}
var onUnfocus: () -> Void = {}

override func becomeFirstResponder() -> Bool {
onFocus()
let textView = window?.fieldEditor(true, for: nil) as? NSTextView
textView?.insertionPointColor = R.nsColor.action
return super.becomeFirstResponder()
}

override func resignFirstResponder() -> Bool {
onUnfocus()
return super.resignFirstResponder()
}
}
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