chore: dart fixes

lib/src/models/documents/attribute.dart

@@ -347,16 +347,20 @@ class LineHeightAttribute extends Attribute<double?> {
       : super('line-height', AttributeScope.block, lineHeight);
 
   /// "attributes":{"line-height": 1.0 }
-  static const Attribute<double?> lineHeightNormal = LineHeightAttribute(lineHeight: 1);
+  static const Attribute<double?> lineHeightNormal =
+      LineHeightAttribute(lineHeight: 1);
 
   /// "attributes":{"line-height": 1.15 }
-  static const Attribute<double?> lineHeightTight = LineHeightAttribute(lineHeight: 1.15);
+  static const Attribute<double?> lineHeightTight =
+      LineHeightAttribute(lineHeight: 1.15);
 
   /// "attributes":{"line-height": 1.5 }
-  static const Attribute<double?> lineHeightOneAndHalf = LineHeightAttribute(lineHeight: 1.5);
+  static const Attribute<double?> lineHeightOneAndHalf =
+      LineHeightAttribute(lineHeight: 1.5);
 
   /// "attributes":{"line-height": 2.0 }
-  static const Attribute<double?> lineHeightDouble = LineHeightAttribute(lineHeight: 2);
+  static const Attribute<double?> lineHeightDouble =
+      LineHeightAttribute(lineHeight: 2);
 }
 
 class IndentAttribute extends Attribute<int?> {

lib/src/widgets/quill/text_line.dart

@@ -9,27 +9,17 @@ import 'package:flutter/services.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../../../flutter_quill.dart';
-import '../../models/documents/attribute.dart';
 import '../../models/documents/nodes/container.dart' as container_node;
-import '../../models/documents/nodes/embeddable.dart';
 import '../../models/documents/nodes/leaf.dart' as leaf;
-import '../../models/documents/nodes/leaf.dart';
-import '../../models/documents/nodes/line.dart';
-import '../../models/documents/nodes/node.dart';
-import '../../models/documents/style.dart';
-import '../../models/structs/vertical_spacing.dart';
 import '../../utils/color.dart';
 import '../../utils/font.dart';
 import '../../utils/platform.dart';
 import '../others/box.dart';
-import '../others/cursor.dart';
-import '../others/default_styles.dart';
 import '../others/delegate.dart';
 import '../others/keyboard_listener.dart';
 import '../others/link.dart';
 import '../others/proxy.dart';
 import '../others/text_selection.dart';
-import 'quill_controller.dart';
 
 class TextLine extends StatefulWidget {
   const TextLine({
@@ -305,10 +295,13 @@ class _TextLineState extends State<TextLine> {
 
     final lineHeight = widget.line.style.attributes[Attribute.lineHeight.key];
     final x = <Attribute, TextStyle>{
-      LineHeightAttribute.lineHeightNormal: defaultStyles.lineHeightNormal!.style,
+      LineHeightAttribute.lineHeightNormal:
+          defaultStyles.lineHeightNormal!.style,
       LineHeightAttribute.lineHeightTight: defaultStyles.lineHeightTight!.style,
-      LineHeightAttribute.lineHeightOneAndHalf: defaultStyles.lineHeightOneAndHalf!.style,
-      LineHeightAttribute.lineHeightDouble: defaultStyles.lineHeightDouble!.style,
+      LineHeightAttribute.lineHeightOneAndHalf:
+          defaultStyles.lineHeightOneAndHalf!.style,
+      LineHeightAttribute.lineHeightDouble:
+          defaultStyles.lineHeightDouble!.style,
     };
 
     textStyle =