An extension to check if NSTextField / NSSearchField is the first responder

NSTextField+FirstResponderCheck.swift

import Cocoa

extension NSView {
	
	var isFirstResponder: Bool {
		window?.firstResponder == self
	}
	
}	

extension NSTextField {

	override var isFirstResponder: Bool {
		if let fieldEditor = currentEditor() {
			return fieldEditor == window?.firstResponder
		}
		return false
	}
	
}