Make things work with really dark backgrounds

This fixes issue #1549

macos/Sources/Helpers/NSView+Extension.swift

@@ -28,4 +28,17 @@ extension NSView {
 
         return result
     }
+
+	/// Recursively finds and returns the first descendant view that has the given identifier.
+	func firstDescendant(withID id: String) -> NSView? {
+		for subview in subviews {
+			if subview.identifier == NSUserInterfaceItemIdentifier(id) {
+				return subview
+			} else if let found = subview.firstDescendant(withID: id) {
+				return found
+			}
+		}
+
+		return nil
+	}
 }