Add extensions to help finding private subviews

macos/Sources/Helpers/NSView+Extension.swift

@@ -0,0 +1,29 @@
+import AppKit
+
+extension NSView {
+    func firstSubview(withClassName name: String) -> NSView? {
+        for subview in subviews {
+            if String(describing: type(of: subview)) == name {
+                return subview
+            } else if let found = subview.firstSubview(withClassName: name) {
+                return found
+            }
+        }
+
+        return nil
+    }
+
+    func subviews(withClassName name: String) -> [NSView] {
+        var result = [NSView]()
+
+        for subview in subviews {
+            if String(describing: type(of: subview)) == name {
+                result.append(subview)
+            }
+
+            result += subview.subviews(withClassName: name)
+        }
+
+        return result
+    }
+}