Issue 22644. Fix for removing non-Dartdoc comments before a declaration.

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 44a595c2cbcb9a04c300bb2261585bdd7489d3ba..c65b545fb8e0c34adcfd4b23edf7b366c3050b0d 100644
--- a/pkg/analyzer/test/generated/incremental_resolver_test.dart
+++ b/pkg/analyzer/test/generated/incremental_resolver_test.dart
@@ -2843,6 +2843,55 @@ main() {
 ''');
   }
 
+  void test_endOfLineComment_header_add() {
+    _resolveUnit(r'''
+main() {
+  Object x;
+  x.foo();
+}
+''');
+    _updateAndValidate(r'''
+// 000
+main() {
+  Object x;
+  x.foo();
+}
+''');
+  }
+
+  void test_endOfLineComment_header_remove() {
+    _resolveUnit(r'''
+// 000
+main() {
+  Object x;
+  x.foo();
+}
+''');
+    _updateAndValidate(r'''
+main() {
+  Object x;
+  x.foo();
+}
+''');
+  }
+
+  void test_endOfLineComment_header_update() {
+    _resolveUnit(r'''
+// 000
+main() {
+  Object x;
+  x.foo();
+}
+''');
+    _updateAndValidate(r'''
+// 10
+main() {
+  Object x;
+  x.foo();
+}
+''');
+  }
+
   void test_endOfLineComment_localFunction_inTopLevelVariable() {
     _resolveUnit(r'''
 typedef int Binary(one, two, three);