refactor: use immutable annotation from flutter foundation instead of meta package in flutter_quill

lib/src/common/structs/image_url.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 @immutable
 class ImageUrl {

lib/src/common/structs/offset_value.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 @immutable
 class OffsetValue<T> {

lib/src/common/structs/optional_size.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 @immutable
 class OptionalSize {

lib/src/common/structs/segment_leaf_node.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 import '../../document/nodes/leaf.dart';
 import '../../document/nodes/line.dart';

lib/src/common/structs/vertical_spacing.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 @immutable
 class VerticalSpacing {

lib/src/controller/quill_controller.dart

@@ -3,7 +3,7 @@ import 'dart:math' as math;
 import 'package:flutter/services.dart' show ClipboardData, Clipboard;
 import 'package:flutter/widgets.dart';
 import 'package:html/parser.dart' as html_parser;
-import 'package:meta/meta.dart';
+import 'package:meta/meta.dart' show experimental;
 
 import '../../quill_delta.dart';
 import '../common/structs/image_url.dart';

lib/src/delta/delta_diff.dart

@@ -1,7 +1,7 @@
 import 'dart:math' as math;
 import 'dart:ui' show TextDirection;
 
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 import '../../quill_delta.dart';
 import '../document/attribute.dart';

lib/src/delta/delta_x.dart

@@ -1,6 +1,8 @@
+import 'package:flutter/foundation.dart' show immutable;
 import 'package:flutter_quill_delta_from_html/flutter_quill_delta_from_html.dart';
 import 'package:markdown/markdown.dart' as md;
-import 'package:meta/meta.dart';
+import 'package:meta/meta.dart' show experimental;
+
 import '../../markdown_quill.dart';
 import '../../quill_delta.dart';
 

lib/src/document/attribute.dart

@@ -1,7 +1,7 @@
-import 'dart:collection';
+import 'dart:collection' show LinkedHashSet, LinkedHashMap;
 
 import 'package:equatable/equatable.dart';
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 import 'package:quiver/core.dart';
 
 import 'custom_attributes.dart';

lib/src/document/structs/doc_change.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 import '../../../quill_delta.dart';
 import '../document.dart';

lib/src/document/structs/history_changed.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 @immutable
 class HistoryChanged {

lib/src/editor/config/editor_configurations.dart

@@ -1,4 +1,3 @@
-// ignore_for_file: public_member_api_docs, sort_constructors_first
 import 'package:equatable/equatable.dart';
 import 'package:flutter/foundation.dart' show Brightness, Uint8List, immutable;
 import 'package:flutter/material.dart'

lib/src/editor/raw_editor/config/raw_editor_configurations.dart

@@ -1,5 +1,5 @@
 import 'package:equatable/equatable.dart';
-import 'package:flutter/foundation.dart' show Brightness, Uint8List;
+import 'package:flutter/foundation.dart' show Brightness, Uint8List, immutable;
 import 'package:flutter/material.dart'
     show
         AdaptiveTextSelectionToolbar,
@@ -26,7 +26,6 @@ import 'package:flutter/widgets.dart'
         Widget,
         MouseCursor,
         SystemMouseCursors;
-import 'package:meta/meta.dart' show immutable;
 
 import '../../../controller/quill_controller.dart';
 import '../../../editor/embed/embed_editor_builder.dart';

lib/src/editor/raw_editor/raw_editor.dart

@@ -8,8 +8,8 @@ import 'package:flutter/widgets.dart'
         State,
         StatefulWidget,
         TextSelectionDelegate,
-        Widget;
+        Widget,
-import 'package:meta/meta.dart' show immutable;
+        immutable;
 
 import '../../common/structs/offset_value.dart';
 import '../editor.dart';

lib/src/editor_toolbar_controller_shared/clipboard/clipboard_service_provider.dart

@@ -1,5 +1,4 @@
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart' show immutable;
-
 import 'clipboard_service.dart';
 import 'default_clipboard_service.dart';
 

lib/src/rules/delete.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 import '../../quill_delta.dart';
 import '../document/attribute.dart';

lib/src/rules/format.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 import '../../quill_delta.dart';
 import '../document/attribute.dart';

lib/src/rules/insert.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/widgets.dart' show immutable;
 
 import '../../quill_delta.dart';
 import '../common/extensions/uri_ext.dart';

lib/src/rules/rule.dart

@@ -1,4 +1,4 @@
-import 'package:meta/meta.dart' show immutable;
+import 'package:flutter/foundation.dart' show immutable;
 
 import '../../quill_delta.dart';
 import '../document/attribute.dart';

lib/src/toolbar/structs/link_dialog_action.dart

@@ -1,5 +1,4 @@
-import 'package:flutter/widgets.dart' show Widget;
+import 'package:flutter/widgets.dart' show Widget, immutable;
-import 'package:meta/meta.dart' show immutable;
 
 @immutable
 class LinkDialogAction {

lib/src/toolbar/theme/quill_dialog_theme.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/foundation.dart' show Diagnosticable;
+import 'package:flutter/foundation.dart' show Diagnosticable, immutable;
 import 'package:flutter/material.dart'
     show
         BoxConstraints,
@@ -8,7 +8,6 @@ import 'package:flutter/material.dart'
         EdgeInsetsGeometry,
         ShapeBorder,
         TextStyle;
-import 'package:meta/meta.dart' show immutable;
 
 /// Used to configure the dialog's look and feel.