The isToggled property is extracted into a class

lib/src/models/config/toolbar/buttons/base.dart

@@ -8,6 +8,15 @@ import '../../../themes/quill_icon_theme.dart' show QuillIconTheme;
 import '../../quill_configurations.dart'
     show kDefaultIconSize, kIconButtonFactor;
 
+class QuillToolbarBaseButtonExtraOptionsIsToggled extends Equatable {
+  const QuillToolbarBaseButtonExtraOptionsIsToggled(this.isToggled);
+
+  final bool isToggled;
+
+  @override
+  List<Object?> get props => [isToggled];
+}
+
 @immutable
 class QuillToolbarBaseButtonExtraOptions extends Equatable {
   const QuillToolbarBaseButtonExtraOptions({

lib/src/models/config/toolbar/buttons/toggle_style.dart

@@ -5,7 +5,8 @@ import 'package:flutter/widgets.dart' show Color;
 import 'base.dart';
 
 class QuillToolbarToggleStyleButtonExtraOptions
-    extends QuillToolbarBaseButtonExtraOptions {
+    extends QuillToolbarBaseButtonExtraOptions
+    implements QuillToolbarBaseButtonExtraOptionsIsToggled {
   const QuillToolbarToggleStyleButtonExtraOptions({
     required super.controller,
     required super.context,
@@ -13,6 +14,7 @@ class QuillToolbarToggleStyleButtonExtraOptions
     required this.isToggled,
   });
 
+  @override
   final bool isToggled;
 }