hasFocus static method
Returns true if the given SuperEditor widget currently has focus, or
false otherwise.
By default, this method expects a single SuperEditor in the widget tree and
finds it byType. To specify one SuperEditor among many, pass a superEditorFinder.
Implementation
static bool hasFocus([Finder? finder]) {
  final element = (finder ?? find.byType(SuperEditor)).evaluate().single as StatefulElement;
  final superEditor = element.state as SuperEditorState;
  return superEditor.focusNode.hasFocus;
}