chore: dart fixes

test/utils/delta_x_test.dart

@@ -3,9 +3,11 @@ import 'package:flutter_quill/src/models/documents/delta_x.dart';
 import 'package:test/test.dart';
 
 void main() {
-  const htmlWithEmp = '<p>This is a normal sentence, and this section has greater emp<em>hasis.</em></p>';
+  const htmlWithEmp =
+      '<p>This is a normal sentence, and this section has greater emp<em>hasis.</em></p>';
 
-  const htmlWithUnderline = '<p>This is a normal sentence, and this section has greater <u>underline</u>';
+  const htmlWithUnderline =
+      '<p>This is a normal sentence, and this section has greater <u>underline</u>';
 
   const htmlWithIframeVideo =
       '<iframe src="https://www.youtube.com/embed/dQw4w9WgXcQ" title="YouTube video player"></iframe>';
@@ -17,13 +19,15 @@ void main() {
       '<a href="https://www.macrumors.com/" type="text/html">fdsfsd</a><br><video src="https://www.youtube.com/embed/dQw4w9WgXcQ">Your browser does not support the video tag.</video>';
 
   final expectedDeltaEmp = Delta.fromOperations([
-    Operation.insert('This is a normal sentence, and this section has greater emp'),
+    Operation.insert(
+        'This is a normal sentence, and this section has greater emp'),
     Operation.insert('hasis.', {'italic': true}),
     Operation.insert('\n'),
   ]);
 
   final expectedDeltaUnderline = Delta.fromOperations([
-    Operation.insert('This is a normal sentence, and this section has greater '),
+    Operation.insert(
+        'This is a normal sentence, and this section has greater '),
     Operation.insert('underline', {'underline': true}),
     Operation.insert('\n'),
   ]);