Fix for incremental resolution in case of inserting a new token into elegant comments.

pkg/analyzer/test/generated/incremental_resolver_test.dart

Index: pkg/analyzer/test/generated/incremental_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/incremental_resolver_test.dart b/pkg/analyzer/test/generated/incremental_resolver_test.dart
index 5e41ef607417a0352e99f2fdd8e08f950bbef8b4..314b7ca4729ad87a41eed13a51f5009b9ff471cd 100644
--- a/pkg/analyzer/test/generated/incremental_resolver_test.dart
+++ b/pkg/analyzer/test/generated/incremental_resolver_test.dart
@@ -2779,6 +2779,38 @@ main() {
 ''');
   }
 
+  void test_dartDoc_elegant_updateText_insertToken() {
+    _resolveUnit(r'''
+/// A
+/// [int]
+class Test {
+}
+''');
+    _updateAndValidate(r'''
+/// A
+///
+/// [int]
+class Test {
+}
+''');
+  }
+
+  void test_dartDoc_elegant_updateText_removeToken() {
+    _resolveUnit(r'''
+/// A
+///
+/// [int]
+class Test {
+}
+''');
+    _updateAndValidate(r'''
+/// A
+/// [int]
+class Test {
+}
+''');
+  }
+
   void test_endOfLineComment_add_beforeKeywordToken() {
     _resolveUnit(r'''
 main() {