Fix for 'implemented' notification after an incremental change.

pkg/analyzer/test/generated/incremental_resolver_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.incremental_resolver_test;
 
 import 'package:analyzer/src/context/cache.dart' as task;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 4073 matching lines @@
 a() {
   print(1)
 }
 b() {
   foo(42);
 }
 foo(String p) {}
 ''');
   }
 
+  void test_true_todoHint() {
+    _resolveUnit(r'''
+main() {
+  print(1);
+}
+foo() {
+ // TODO
+}
+''');
+    List<AnalysisError> oldErrors = analysisContext.computeErrors(source);
+    _updateAndValidate(r'''
+main() {
+  print(2);
+}
+foo() {
+ // TODO
+}
+''');
+    List<AnalysisError> newErrors = analysisContext.computeErrors(source);
+    _assertEqualErrors(newErrors, oldErrors);
+  }
+
   void test_true_wholeConstructor() {
     _resolveUnit(r'''
 class A {
   A(int a) {
     print(a);
   }
 }
 ''');
     _updateAndValidate(r'''
 class A {
@@ skipping 57 matching lines @@
 ''');
     _updateAndValidate(r'''
 class A {
   main(int b) {
     print(b);
   }
 }
 ''');
   }
 
-  void test_true_todoHint() {
-    _resolveUnit(r'''
-main() {
-  print(1);
-}
-foo() {
- // TODO
-}
-''');
-    List<AnalysisError> oldErrors = analysisContext.computeErrors(source);
-    _updateAndValidate(r'''
-main() {
-  print(2);
-}
-foo() {
- // TODO
-}
-''');
-    List<AnalysisError> newErrors = analysisContext.computeErrors(source);
-    _assertEqualErrors(newErrors, oldErrors);
-  }
-
   void test_unusedHint_add_wasUsedOnlyInPart() {
     Source partSource = addNamedSource(
         '/my_unit.dart',
         r'''
 part of lib;
 
 f(A a) {
   a._foo();
 }
 ''');
@@ skipping 230 matching lines @@
 }
 f2() {
   print(22);
 }
 f3() {
   print(333)
 }
 ''');
   }
 
+  void test_whitespace_getElementAt() {
+    _resolveUnit(r'''
+class A {}
+class B extends A {}
+''');
+    {
+      ClassElement typeA = oldUnitElement.getType('A');
+      expect(oldUnitElement.getElementAt(typeA.nameOffset), typeA);
+    }
+    {
+      ClassElement typeB = oldUnitElement.getType('B');
+      expect(oldUnitElement.getElementAt(typeB.nameOffset), typeB);
+    }
+    _updateAndValidate(r'''
+class A {}
+
+class B extends A {}
+''');
+    // getElementAt() caches results, it should be notificed it when offset
+    // are changed.
+    {
+      ClassElement typeA = oldUnitElement.getType('A');
+      expect(oldUnitElement.getElementAt(typeA.nameOffset), typeA);
+    }
+    {
+      ClassElement typeB = oldUnitElement.getType('B');
+      expect(oldUnitElement.getElementAt(typeB.nameOffset), typeB);
+    }
+  }
+
   void _assertEqualLineInfo(LineInfo incrLineInfo, LineInfo fullLineInfo) {
     for (int offset = 0; offset < 1000; offset++) {
       LineInfo_Location incrLocation = incrLineInfo.getLocation(offset);
       LineInfo_Location fullLocation = fullLineInfo.getLocation(offset);
       if (incrLocation.lineNumber != fullLocation.lineNumber ||
           incrLocation.columnNumber != fullLocation.columnNumber) {
         fail('At offset $offset ' +
             '(${incrLocation.lineNumber}, ${incrLocation.columnNumber})' +
             ' != ' +
             '(${fullLocation.lineNumber}, ${fullLocation.columnNumber})');
@@ skipping 321 matching lines @@
     return ResolutionContextBuilder.contextFor(node, listener).scope;
   }
 }
 
 class _Edit {
   final int offset;
   final int length;
   final String replacement;
   _Edit(this.offset, this.length, this.replacement);
 }